Derivative Instruments, Hedging Activities and Fair Value - Derivatives Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Product Revenues	$ 350,898	$ 339,907	$ 680,800	$ 664,347
Interest Expense	(6,103)	(5,681)	(11,610)	(11,271)
Income From Discontinued Businesses	9,936	11,988	23,686	21,233
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(2,384)		(2,365)
Product Revenues | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Product Revenues | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	433		465
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		(103)		109
Amount excluded from effectiveness testing recognized in earnings	238		316
Amount excluded from effectiveness testing recognized in earnings		0		0
Product Revenues | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0		0
Cost of Services Sold | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0	0	0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Cost of Services Sold | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(44)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0	(44)	0
Amount excluded from effectiveness testing recognized in earnings	0
Amount excluded from effectiveness testing recognized in earnings		12	0	(7)
Cost of Services Sold | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0	0	0	0
Interest Expense | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	271		572
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		235		235
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	0		0
Interest Expense | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		0		0
Amount excluded from effectiveness testing recognized in earnings	0		0
Amount excluded from effectiveness testing recognized in earnings		0		0
Interest Expense | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	(303)		(617)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		(377)		(648)
Income From Discontinued Businesses | Interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring	(2,741)		(2,741)
Income From Discontinued Businesses | Foreign exchange contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Amount excluded from effectiveness testing recognized in earnings	0		0
Income From Discontinued Businesses | Cross-currency interest rate swaps
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	0		0
Cost of services and products sold | Foreign currency exchange forward contracts
Derivative [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	389		421
Amount of Gain Recognized in Income on Derivatives	2,770	15,731	5,094	10,265
Product Revenues
Derivative [Line Items]
Product Revenues	112,895	94,199	213,277	174,429
Cost of services sold	79,355	64,849	148,664	123,802
Products And Services, Service Revenue [Member]
Derivative [Line Items]
Product Revenues	238,003	245,708	467,523	489,918
Cost of services sold	$ 186,840	$ 187,393	$ 368,711	$ 379,068