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Derivatives and Hedging - Summary of Fair Value of Derivative Instruments by Contract Type and Location of Asset and/or Liability on Consolidated Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Foreign currency exchange contracts, asset derivatives designated as hedging instruments, fair value $ 586 $ 168
Foreign currency exchange contracts, asset derivatives not designated as hedging instruments, fair value 1,514 11
Accounts payable and accrued expenses    
Derivatives, Fair Value [Line Items]    
Foreign currency exchange contracts, liability derivatives designated as hedging instruments, fair value 126 194
Foreign currency exchange contracts, liability derivatives not designated as hedging instruments, fair value $ 309 $ 45