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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Forward points expensed on derivatives $ 116   $ 335  
Other (expense) income, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Net Gain (Loss) Recognized in Income on Derivative Instruments 1,802 $ (1,233) 5,161 $ (6,469)
Foreign Exchange Forward | Cost Of Goods Sold        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain Reclassified from AOCI into COGS $ 168 $ 1,067 $ 32 $ 249