Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects on consolidated financial statements of foreign currency contracts which were not designated as hedging instruments (Details 4)

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Fair Value Measurements and Derivatives - Effects on consolidated financial statements of foreign currency contracts which were not designated as hedging instruments (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Not Designated as Hedging Instrument | Foreign currency contracts      
Derivative Instruments Gain Loss [Line Items]      
Gain recognized in other income (expense), net $ 0 $ 0 $ 4,179