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Derivatives - Impact of Derivative Instruments on Income Statement (Details) - Not Designated as Hedging Instrument - Foreign currency contracts - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative [Line Items]    
Total net income (loss) on foreign currency contracts $ (201) $ (1,688)
Other income (expense)    
Derivative [Line Items]    
Unrealized gain (loss) on foreign currency contracts (456) (974)
Realized gain (loss) on foreign currency contracts $ 255 $ (714)