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Derivatives - Impact of Derivative Instruments on Income Statement (Details) - Not Designated as Hedging Instrument - Other income, net - Foreign currency contracts - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]        
Unrealized gain (loss) on foreign currency contracts $ (274) $ 1,293 $ (730) $ 319
Realized loss on foreign currency contracts (807) (865) (552) (1,579)
Total net income (loss) on foreign currency contracts $ (1,081) $ 428 $ (1,282) $ (1,260)