Components of Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Operating Income (Expense), Net	$ 292		$ 1,717		$ (5,441)	$ (26)
Product revenues	447,281		350,898		846,122	680,800
Interest expense	14,953		6,103		27,602	11,610
Income from continuing operations before income taxes	(11,978)		3,380		(20,452)	16,892
Income tax expense (benefit)	(2,304)		3,994		(2,986)	5,213
Net income (loss)	(9,455)	$ 1,227	10,929	$ 22,537	(8,228)	33,466
Amount Reclassified from Accumulated Other Comprehensive Loss | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Operating Income (Expense), Net	0
Amount Reclassified from Accumulated Other Comprehensive Loss | Cumulative Unrecognized Actuarial Losses on Pension Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes	4,863		5,176		15,413	10,300
Income tax expense (benefit)	(323)		(379)		(2,033)	(721)
Net income (loss)	4,540		4,797		13,380	9,579
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income taxes	695		2,384		(26)	2,365
Income tax expense (benefit)	(263)		(599)		(187)	(643)
Net income (loss)	432		1,785		(213)	1,722
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Foreign currency exchange forward contracts
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Operating Income (Expense), Net			0		0	(2,271)
Discontinued Operation, Gain From Disposal Of Discontinued Operation, Before Income Tax	0		0		12,906	0
Product revenues	(332)		(433)		(1,736)	(465)
Cost of services sold	0		44		0	44
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Cross currency interest rate swaps
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	295		303		600	617
Amount Reclassified from Accumulated Other Comprehensive Loss | Effective Portion of Deriviatives Designated as Hedging Instruments | Interest rate swaps
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	732		(271)		1,110	(572)
Income from discontinued business	0		2,741		0	2,741
Amount Reclassified from Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension income (expense)	4,757		4,982		9,837	10,040
Amount Reclassified from Accumulated Other Comprehensive Loss | Prior service costs (benefits)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension income (expense)	0		0		5,363	0
Amount Reclassified from Accumulated Other Comprehensive Loss | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension income (expense)	106		65		213	131
Amount Reclassified from Accumulated Other Comprehensive Loss | AOCI Attributable to Parent
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit pension income (expense)	$ 0		$ 129		$ 0	$ 129