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Derivative Instruments, Hedging Activities and Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Effect of derivative instruments    
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion $ (400) $ (2,886)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion (243) 465
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing (210) 4,261
Foreign currency forward exchange contracts    
Effect of derivative instruments    
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion (236) (325)
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing 0 0
Foreign currency forward exchange contracts | Cost of services and products sold    
Effect of derivative instruments    
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion (1) 408
Derivatives Not Designated as Hedging Instruments    
Amount of Gain (Loss) Recognized in Income on Derivative 1,550 (6,844)
Interest rate swaps    
Effect of derivative instruments    
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion (522)  
Cross currency interest rate swaps    
Effect of derivative instruments    
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion 358 (2,561)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion (242) 57
Cross currency interest rate swaps | Cost of services and products sold    
Effect of derivative instruments    
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing $ (210) $ 4,261