Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Foreign Currency Which Was not Designated As Cash Flow Hedge (Details 8)

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Which Was not Designated As Cash Flow Hedge (Details 8) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Not Designated as Hedging Instrument | Foreign Currency Collar | Cash Flow Hedging        
Derivative Instruments Gain Loss [Line Items]        
Gain recognized in other income (expense) $ (3,313) $ 10,312