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Derivatives and Hedging - Location of Gains in Consolidated Condensed Statements of Operations that were Recognized and Derivative Contract Type (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Foreign Currency Transaction Gain (Loss), before Tax $ (5,338) $ 635
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax 676 45
Other (expense) income, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Net Gain (Loss) Recognized in Income on Derivative Instruments $ 750 $ (6,469)