Derivative Instruments, Hedging Activities and Fair Value - Effect of Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	$ (473)	$ (116)	$ (455)	$ (1,599)
Amount Reclassified from AOCI into Income - Effective Portion or Equity	865	695	1,680	(26)
Foreign currency exchange forward contracts
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	(440)	41	(441)	2,078
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	3	(332)	(47)	(1,736)
Interest rate swaps
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	(33)	(162)	(14)	(3,740)
Interest rate swaps | Interest Expense
Effect of derivative instruments
Amount Reclassified from AOCI into Income - Effective Portion or Equity	862	732	1,727	1,110
Cross currency interest rate swaps
Effect of derivative instruments
Amount Recognized in OCI on Derivatives	0	5	0	63
Cross currency interest rate swaps | Interest Expense
Effect of derivative instruments
Amount Reclassified from AOCI into Income - Effective Portion or Equity	$ 0	$ 295	$ 0	$ 600