Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of foreign currency forward contracts which were not designated as cash flow hedges (Details 6)

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Fair Value Measurements and Derivatives - Effects of foreign currency forward contracts which were not designated as cash flow hedges (Details 6) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Cash Flow Hedging | Foreign Currency Forward Contracts | Not Designated as Hedging Instrument        
Loss recognized in other income (expense), net $ 0 $ 0 $ 0 $ (6,133)