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Derivatives - Impact of Derivative Instruments on Income Statement (Details) - Not Designated as Hedging Instrument - Foreign currency contracts - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative [Line Items]        
Total net income (loss) on foreign currency contracts $ (104,000) $ 0 $ (1,364,000) $ 0
Other income        
Derivative [Line Items]        
Unrealized loss on foreign currency contracts (615,000) 0 (296,000) 0
Realized gain (loss) on foreign currency contracts $ 511,000 $ 0 $ (1,068,000) $ 0