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Fair Value Measurements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 144,847  
Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 73,358  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 19,233  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Other Adjustments (27,118)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Foreign Currency Translation Adjustment 1,336  
Fair Value, Inputs, Level 1 | Six Point Five Zero Percentage Notes [Domain]    
Liabilities:    
Long term debt, Carrying Amount 900,000 $ 900,000
Long term debt, Fair Value $ 909,000 $ 812,250