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Derivative Instruments, Hedging Activities and Fair Value (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Effect of derivative instruments        
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion $ 1,926 $ 2,168 $ 23 $ (613)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion 252 254 560 69
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing (103) (232) (420) 3,987
Foreign currency forward exchange contracts        
Effect of derivative instruments        
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion 2,333 2,378 3,096 1,748
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing 0 0 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 0 0 (185) (409)
Derivatives Not Designated as Hedging Instruments        
Amount of Gain (Loss) Recognized in Income on Derivative (7,025) 552 (18,764) 2,292
Interest rate swaps        
Effect of derivative instruments        
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion (335)   (2,878)  
Cross currency interest rate swaps        
Effect of derivative instruments        
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion (72) (210) (195) (2,361)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion 252 254 745 478
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 $ (103) $ (232) $ (420) $ 3,987