Financial Instruments - Effect of Derivative Instruments on the Consolidated Statements of Operations and the Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Product revenues		$ 1,503,742	$ 1,347,672	$ 1,307,470
Interest expense		(36,586)	(21,531)	(26,862)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		27,531	43,942	20,379
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		(2,934)
Foreign currency exchange forward contracts | Product revenues / Cost of services and products sold
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		506
Derivative Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative for the Twelve Months Ended December 31		6,807	17,262	(23,572)
Foreign currency exchange forward contracts | Retained Earnings
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Interest rate swaps | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			0
Interest rate swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		520
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			1,108
Interest rate swaps | Cost of Goods and Service Benchmark [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			0
Interest rate swaps | Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	$ (2,700)	(2,741)
Cross-currency interest rate swaps | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			0	0
Amount of Gain (Loss) Recognized in Income on Derivative—Ineffective Portion and Amount Excluded from Effectiveness Testing				0
Cross-currency interest rate swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		(1,219)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			(1,264)	(1,002)
Amount of Gain (Loss) Recognized in Income on Derivative—Ineffective Portion and Amount Excluded from Effectiveness Testing				(420)
Cross-currency interest rate swaps | Cost of Goods and Service Benchmark [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			0	0
Amount of Gain (Loss) Recognized in Income on Derivative—Ineffective Portion and Amount Excluded from Effectiveness Testing				0
Cross-currency interest rate swaps | Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Foreign Exchange Contract [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		550
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax		509
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			374	936
Amount of Gain (Loss) Recognized in Income on Derivative—Ineffective Portion and Amount Excluded from Effectiveness Testing			(440)	(105)
Foreign Exchange Contract [Member] | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			0	0
Amount of Gain (Loss) Recognized in Income on Derivative—Ineffective Portion and Amount Excluded from Effectiveness Testing			0	0
Foreign Exchange Contract [Member] | Cost of Goods and Service Benchmark [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		(44)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax			0	18
Amount of Gain (Loss) Recognized in Income on Derivative—Ineffective Portion and Amount Excluded from Effectiveness Testing			1	0
Foreign Exchange Contract [Member] | Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		0
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax		0
Product
Derivative Instruments, Gain (Loss) [Line Items]
Product revenues		422,269	392,208	373,188
Cost of services and products sold		305,134	266,792	260,347
Products And Services, Service Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cost of services and products sold		$ 839,156	$ 745,748	$ 737,499