Derivative Instruments, Hedging Activities and Fair Value - Derivatives Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Product Revenues		$ 423,155	$ 351,563	$ 1,103,955	$ 1,015,910
Interest Expense		(12,819)	(5,620)	(24,429)	(16,891)
Income From Discontinued Businesses		272	10,866	23,958	32,099
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income		297		(2,068)
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		512		977
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income			3		112
Amount excluded from effectiveness testing recognized in earnings		86		403
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		0
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			(108)	0	(116)
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		76		648
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income			367		602
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		(291)		(908)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income			(312)		(960)
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	$ (2,700)			(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		512		933
Amount of Gain Recognized in Income on Derivatives		10,642	3,194	15,735	13,459
Product Revenues
Derivative [Line Items]
Product Revenues		106,488	127,367	319,765	301,796
Cost of services sold		71,970	82,139	220,634	205,941
Products And Services, Service Revenue [Member]
Derivative [Line Items]
Product Revenues		316,667	224,196	784,190	714,114
Cost of services sold		$ 239,519	$ 174,937	$ 608,230	$ 554,005