Derivative Instruments, Hedging Activities and Fair Value - Effect of Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	$ 584	$ (1,363)	$ 129	$ (2,962)
Amount Reclassified from AOCI into Income - Effective Portion or Equity	454	1,225	2,134	1,199
Foreign currency exchange forward contracts
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	611	(1,244)	170	834
Foreign currency exchange forward contracts | Cost of services and products sold
Effect of derivative instruments
Amount Reclassified from AOCI into Income - Effective Portion or Equity	(418)	174	(465)	(1,562)
Interest rate swaps
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	(27)	(95)	(41)	(3,835)
Interest rate swaps | Interest Expense
Effect of derivative instruments
Amount Reclassified from AOCI into Income - Effective Portion or Equity	872	739	2,599	1,849
Cross currency interest rate swaps
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	0	(24)	0	39
Cross currency interest rate swaps | Interest Expense
Effect of derivative instruments
Amount Reclassified from AOCI into Income - Effective Portion or Equity	$ 0	$ 312	$ 0	$ 912