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Derivatives and Hedging Instruments - Effects of Derivatives Designated as Hedging Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative [Line Items]        
Gain or (Loss) Recognized in OCI $ (786) $ 998 $ (1,615) $ 922
Foreign currency exchange contracts | Cash Flow Hedging | Salaries and employee benefits        
Derivative [Line Items]        
Gain or (Loss) Recognized in OCI (967) 1,146 (1,074) 1,735
Gain or (Loss) Reclassified from OCI into Income - Effective Portion 434 297 983 472
Foreign currency exchange contracts | Cash Flow Hedging | General and administrative expenses        
Derivative [Line Items]        
Gain or (Loss) Recognized in OCI (76) 160 (76) 240
Gain or (Loss) Reclassified from OCI into Income - Effective Portion 35 27 35 41
Interest rate swap agreements | Cash Flow Hedging | Interest expense        
Derivative [Line Items]        
Gain or (Loss) Recognized in OCI (21) 14 (12) 19
Gain or (Loss) Reclassified from OCI into Income - Effective Portion $ 8 $ 33 $ 25 $ 110