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changes.","units":{"USD":[{"start":"2009-01-01","end":"2009-06-30","val":22241000,"accn":"0001193125-10-181342","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2009-01-01","end":"2009-09-30","val":50592000,"accn":"0001193125-10-248043","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04"},{"start":"2010-01-01","end":"2010-06-30","val":28790000,"accn":"0001193125-10-181342","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06"},{"start":"2010-01-01","end":"2010-09-30","val":61583000,"accn":"0001193125-10-248043","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-04"},{"start":"2012-01-01","end":"2012-03-31","val":5061000,"accn":"0001169264-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":-36157000,"accn":"0001169264-13-000022","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"start":"2012-01-01","end":"2012-09-30","val":-58411000,"accn":"0001169264-13-000035","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2012-01-01","end":"2012-12-31","val":5442000,"accn":"0001169264-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":-3572000,"accn":"0001169264-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08"},{"start":"2013-01-01","end":"2013-03-31","val":-3572000,"accn":"0001169264-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":41600000,"accn":"0001169264-13-000022","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"start":"2013-01-01","end":"2013-06-30","val":41600000,"accn":"0001169264-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-12"},{"start":"2013-01-01","end":"2013-09-30","val":-6356000,"accn":"0001169264-13-000035","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"start":"2013-01-01","end":"2013-09-30","val":-6356000,"accn":"0001169264-14-000035","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2013-01-01","end":"2013-12-31","val":74205000,"accn":"0001169264-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"start":"2013-01-01","end":"2013-12-31","val":74205000,"accn":"0001169264-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-29","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":-12438000,"accn":"0001169264-14-000020","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"start":"2014-01-01","end":"2014-03-31","val":-12438000,"accn":"0001169264-15-000016","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-12","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":7849000,"accn":"0001169264-14-000029","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-12"},{"start":"2014-01-01","end":"2014-06-30","val":7849000,"accn":"0001169264-15-000019","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-12"},{"start":"2014-01-01","end":"2014-09-30","val":-168523000,"accn":"0001169264-14-000035","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"start":"2014-01-01","end":"2014-09-30","val":-168523000,"accn":"0001169264-15-000024","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-09"},{"start":"2014-01-01","end":"2014-12-31","val":-217053000,"accn":"0001169264-15-000010","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-11"},{"start":"2014-01-01","end":"2014-12-31","val":-217053000,"accn":"0001169264-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-29"},{"start":"2014-01-01","end":"2014-12-31","val":-217053000,"accn":"0001169264-17-000005","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-07","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":-15084000,"accn":"0001169264-15-000016","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-12"},{"start":"2015-01-01","end":"2015-03-31","val":-15084000,"accn":"0001169264-16-000035","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":21148000,"accn":"0001169264-15-000019","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-12"},{"start":"2015-01-01","end":"2015-06-30","val":21148000,"accn":"0001169264-16-000039","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-11"},{"start":"2015-01-01","end":"2015-09-30","val":34795000,"accn":"0001169264-15-000024","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-09"},{"start":"2015-01-01","end":"2015-09-30","val":34795000,"accn":"0001169264-16-000046","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-08"},{"start":"2015-01-01","end":"2015-12-31","val":77234000,"accn":"0001169264-16-000032","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-29"},{"start":"2015-01-01","end":"2015-12-31","val":77234000,"accn":"0001169264-17-000005","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-07"},{"start":"2015-01-01","end":"2015-12-31","val":77234000,"accn":"0001169264-18-000014","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-14","frame":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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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 rates.","units":{"USD":[{"end":"2016-03-31","val":97217000,"accn":"0001169264-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2016Q1I"},{"end":"2016-12-31","val":137637000,"accn":"0001169264-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09"},{"end":"2016-12-31","val":137690000,"accn":"0001169264-18-000026","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-13"},{"end":"2016-12-31","val":137690000,"accn":"0001169264-18-000030","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2016Q4I"},{"end":"2017-03-31","val":97217000,"accn":"0001169264-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2017Q1I"},{"end":"2017-06-30","val":104552000,"accn":"0001169264-18-000026","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-13"},{"end":"2017-06-30","val":122254000,"accn":"0001169264-18-000030","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2017Q2I"},{"end":"2017-09-30","val":122254000,"accn":"0001169264-18-000030","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2017Q3I"},{"end":"2017-12-31","val":128677000,"accn":"0001169264-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09"},{"end":"2017-12-31","val":128677000,"accn":"0001169264-18-000026","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-13"},{"end":"2017-12-31","val":128677000,"accn":"0001169264-18-000030","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2017Q4I"},{"end":"2018-03-31","val":86006000,"accn":"0001169264-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2018Q1I"},{"end":"2018-06-30","val":82184000,"accn":"0001169264-18-000026","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-13","frame":"CY2018Q2I"},{"end":"2018-09-30","val":76975000,"accn":"0001169264-18-000030","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2018Q3I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. 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 rates.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":-40420000,"accn":"0001169264-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-33138000,"accn":"0001169264-18-000026","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-13"},{"start":"2017-01-01","end":"2017-09-30","val":-15436000,"accn":"0001169264-18-000030","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"start":"2018-01-01","end":"2018-03-31","val":-42671000,"accn":"0001169264-18-000023","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-46493000,"accn":"0001169264-18-000026","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-13"},{"start":"2018-01-01","end":"2018-09-30","val":-51702000,"accn":"0001169264-18-000030","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"}]}},"CertificatesOfDepositAtCarryingValue":{"label":"Certificates 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":"2012-12-31","val":1000000,"accn":"0001169264-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-25","frame":"CY2012Q4I"},{"end":"2012-12-31","val":1000000,"accn":"0001169264-13-000035","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"end":"2013-09-30","val":4800000,"accn":"0001169264-14-000006","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-25","frame":"CY2013Q3I"},{"end":"2013-09-30","val":4800000,"accn":"0001169264-13-000035","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"}]}},"CommitmentsAndContingencies":{"label":"Commitments and Contingencies","description":"Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to 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