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and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate 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of Deposit, at Carrying Value","description":"A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.","units":{"USD":[{"end":"2014-12-31","val":300000,"accn":"0001047469-15-002282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q4I"}]}},"CommonStockParOrStatedValuePerShare":{"label":"Common Stock, Par or Stated Value Per Share","description":"Face amount or stated value per share of common stock.","units":{"USD/shares":[{"end":"2010-08-05","val":0,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2010Q2I"},{"end":"2010-08-05","val":0,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"end":"2010-12-31","val":0,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2010Q4I"},{"end":"2011-12-31","val":0,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"},{"end":"2012-12-31","val":0,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2012Q4I"},{"end":"2012-12-31","val":0,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"end":"2013-12-31","val":0,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"}]}},"CommonStockSharesAuthorized":{"label":"Common Stock, Shares Authorized","description":"The maximum number of common shares permitted to be issued by an entity's charter and bylaws.","units":{"shares":[{"end":"2010-08-04","val":100000000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2010Q2I"},{"end":"2010-08-04","val":50000000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"end":"2010-08-05","val":100000000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"end":"2010-12-31","val":100000000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2010Q4I"},{"end":"2011-12-31","val":100000000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2011Q4I"},{"end":"2011-12-31","val":100000000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"},{"end":"2012-12-31","val":100000000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2012Q4I"},{"end":"2012-12-31","val":100000000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"end":"2013-12-31","val":100000000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013Q4I"}]}},"CommonStockSharesIssued":{"label":"Common Stock, Shares, Issued","description":"Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). 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fixtures.","units":{"USD":[{"end":"2010-12-31","val":314484000,"accn":"0001047469-11-007144","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2010-12-31","val":314484000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2010-12-31","val":314484000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2010Q4I"},{"end":"2011-06-30","val":304181000,"accn":"0001047469-11-007144","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":299923000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2011Q3I"},{"end":"2011-12-31","val":299579000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"},{"end":"2011-12-31","val":299579000,"accn":"0001047469-12-005722","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2011-12-31","val":299579000,"accn":"0001047469-12-008060","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2011-12-31","val":299579000,"accn":"0001047469-12-010191","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"end":"2011-12-31","val":299579000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2011Q4I"},{"end":"2012-03-31","val":321415000,"accn":"0001047469-12-005722","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1I"},{"end":"2012-06-30","val":385487000,"accn":"0001047469-12-008060","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":391992000,"accn":"0001047469-12-010191","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07","frame":"CY2012Q3I"},{"end":"2012-12-31","val":387015000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"end":"2012-12-31","val":387015000,"accn":"0001047469-13-005654","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07"},{"end":"2012-12-31","val":387015000,"accn":"0001047469-13-008140","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"end":"2012-12-31","val":387015000,"accn":"0001047469-13-010460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":387015000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2012Q4I"},{"end":"2013-03-31","val":382222000,"accn":"0001047469-13-005654","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":380010000,"accn":"0001047469-13-008140","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06","frame":"CY2013Q2I"},{"end":"2013-09-30","val":375749000,"accn":"0001047469-13-010460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":371364000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":371364000,"accn":"0001047469-14-004839","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12"},{"end":"2013-12-31","val":371364000,"accn":"0001047469-14-006801","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2013Q4I"},{"end":"2014-03-31","val":366934000,"accn":"0001047469-14-004839","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12","frame":"CY2014Q1I"},{"end":"2014-06-30","val":362938000,"accn":"0001047469-14-006801","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":269189000,"accn":"0001047469-14-009225","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14","frame":"CY2014Q3I"},{"end":"2014-12-31","val":283191000,"accn":"0001047469-15-002282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16"},{"end":"2014-12-31","val":283191000,"accn":"0001047469-15-004634","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2014Q4I"},{"end":"2015-03-31","val":278475000,"accn":"0001047469-15-004634","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"}]}},"ProvisionForDoubtfulAccounts":{"label":"Accounts Receivable, Credit Loss Expense (Reversal)","description":"Amount of expense (reversal of expense) for expected credit loss on accounts receivable.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":437000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":73000,"accn":"0001047469-11-007144","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2010-01-01","end":"2010-09-30","val":97000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2010-01-01","end":"2010-12-31","val":209000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"},{"start":"2010-01-01","end":"2010-12-31","val":209000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":49000,"accn":"0001047469-12-005722","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":32000,"accn":"0001047469-11-007144","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2011-01-01","end":"2011-06-30","val":32000,"accn":"0001047469-12-008060","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2011-01-01","end":"2011-09-30","val":84000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2011-01-01","end":"2011-09-30","val":84000,"accn":"0001047469-12-010191","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2011-01-01","end":"2011-12-31","val":109000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"},{"start":"2011-01-01","end":"2011-12-31","val":109000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"start":"2011-01-01","end":"2011-12-31","val":109000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-8000,"accn":"0001047469-12-005722","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"start":"2012-01-01","end":"2012-03-31","val":-8000,"accn":"0001047469-13-005654","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-4000,"accn":"0001047469-12-008060","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2012-01-01","end":"2012-06-30","val":-4000,"accn":"0001047469-13-008140","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2012-01-01","end":"2012-09-30","val":33000,"accn":"0001047469-12-010191","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2012-01-01","end":"2012-09-30","val":33000,"accn":"0001047469-13-010460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"start":"2012-01-01","end":"2012-12-31","val":118000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"start":"2012-01-01","end":"2012-12-31","val":118000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":6000,"accn":"0001047469-13-005654","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07"},{"start":"2013-01-01","end":"2013-03-31","val":6000,"accn":"0001047469-14-004839","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":41000,"accn":"0001047469-13-008140","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2013-01-01","end":"2013-06-30","val":41000,"accn":"0001047469-14-006801","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"start":"2013-01-01","end":"2013-09-30","val":64000,"accn":"0001047469-13-010460","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":71000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-4000,"accn":"0001047469-14-004839","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-12","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":26000,"accn":"0001047469-14-006801","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"start":"2014-09-19","end":"2014-12-31","val":-22000,"accn":"0001047469-15-002282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q4"},{"start":"2015-01-01","end":"2015-03-31","val":49000,"accn":"0001047469-15-004634","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1"}]}},"RepaymentsOfAdvancesForConstruction":{"label":"Repayments of Advances for Construction","description":"The cash outflow for the payments made by the entity, generally on a straight-line basis over periods ranging from five to forty years to developers, builders, government agencies and municipalities for borrowings received in construction.","units":{"USD":[{"start":"2011-01-01","end":"2011-09-30","val":130049000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":130114000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":-13144000,"accn":"0001047469-12-005722","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1"}]}},"RepaymentsOfLongTermDebt":{"label":"Repayments of Long-term Debt","description":"The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.","units":{"USD":[{"start":"2011-01-01","end":"2011-03-31","val":305000,"accn":"0001047469-12-005722","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2011Q1"}]}},"RepaymentsOfLongTermDebtAndCapitalSecurities":{"label":"Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security","description":"Amount of cash outflow for debt, mandatory redeemable security, and principal payment for finance lease obligation.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":26317000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":5344000,"accn":"0001047469-11-007144","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2010-01-01","end":"2010-09-30","val":17303000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2010-01-01","end":"2010-12-31","val":17597000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":17597000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"},{"start":"2011-01-01","end":"2011-06-30","val":616000,"accn":"0001047469-12-008060","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2011-01-01","end":"2011-06-30","val":616000,"accn":"0001047469-11-007144","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2011-01-01","end":"2011-09-30","val":1615000,"accn":"0001047469-12-010191","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2011-01-01","end":"2011-09-30","val":1615000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":1866000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":1866000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"start":"2011-01-01","end":"2011-12-31","val":1866000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"}]}},"RepaymentsOfSecuredDebt":{"label":"Repayments of Secured Debt","description":"The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":101949000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2009"},{"start":"2011-01-01","end":"2011-12-31","val":276996000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"start":"2011-01-01","end":"2011-12-31","val":276996000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2011"},{"start":"2014-09-19","end":"2014-12-31","val":11025000,"accn":"0001047469-15-002282","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q4"}]}},"RepaymentsOfSeniorDebt":{"label":"Repayments of Senior Debt","description":"The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.","units":{"USD":[{"start":"2011-01-01","end":"2011-09-30","val":276996000,"accn":"0001047469-12-010191","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2011-01-01","end":"2011-09-30","val":276996000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":276996000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2011"}]}},"RepaymentsOfSubordinatedDebt":{"label":"Repayments of Subordinated Debt","description":"The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.","units":{"USD":[{"start":"2011-01-01","end":"2011-09-30","val":125247000,"accn":"0001047469-12-010191","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2011-01-01","end":"2011-09-30","val":125247000,"accn":"0001047469-11-009267","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":125247000,"accn":"0001047469-14-002419","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":125247000,"accn":"0001047469-13-002841","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"start":"2011-01-01","end":"2011-12-31","val":125247000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"}]}},"RepaymentsOfUnsecuredDebt":{"label":"Repayments of Unsecured Debt","description":"The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":130650000,"accn":"0001047469-12-002743","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15","frame":"CY2009"}]}},"RestrictedCashAndCashEquivalentsAtCarryingValue":{"label":"Restricted Cash and Cash Equivalents, Current","description":"Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest 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