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 10)

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Fair Value Measurements and Derivatives - Effects of Foreign Currency Which Was not Designated As Cash Flow Hedge (Details 10) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Not Designated as Hedging Instrument | Foreign Currency Collar        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) recognized in other income (expense) $ 9,350   $ (19,603)