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Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2014-12-31","val":57000000,"accn":"0001089819-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":34000000,"accn":"0001089819-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"}]}},"LineOfCreditFacilityAmountOutstanding":{"label":"Line of Credit Facility, Amount Outstanding (Deprecated 2014-01-31)","description":"Amount borrowed under the credit facility as of the balance sheet date.","units":{"USD":[{"end":"2012-06-30","val":0,"accn":"0001089819-12-000049","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0001089819-12-000062","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"}]}},"LineOfCreditFacilityMaximumBorrowingCapacity":{"label":"Line of Credit Facility, Maximum Borrowing Capacity","description":"Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.","units":{"USD":[{"end":"2011-12-31","val":0,"accn":"0001089819-12-000032","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-02","frame":"CY2011Q4I"},{"end":"2015-12-31","val":550000000,"accn":"0001089819-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"},{"end":"2017-12-31","val":400000000,"accn":"0001089819-18-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-21","frame":"CY2017Q4I"}]}},"LoansPayableToBank":{"label":"Loans Payable to Bank","description":"Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.","units":{"USD":[{"end":"2014-12-31","val":35000000,"accn":"0001089819-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0,"accn":"0001089819-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2015Q4I"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. 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