Segment and Related Information - Reconciliation of the Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment and Related Information
Income (loss) from operations	$ 20,094		$ 38,861		$ 22,115	$ 29,688
Interest expense, net	7,152		8,636		14,492	16,906
Non-service defined benefit plan expense	167		158		334	316
Income before income taxes	12,775		30,067		7,289	12,466
Provision (benefit) for income taxes	2,616		(987)		460	(2,840)
Net income	10,159	$ (3,330)	31,054	$ (15,748)	6,829	15,306
Consolidated net revenues	280,819		233,434		518,289	467,173
Consolidated material costs	89,271		69,972		164,441	147,213
Corporate & other
Segment and Related Information
Income (loss) from operations	(22,947)		(25,516)		(44,652)	(48,306)
Consolidating adjustments
Segment and Related Information
Consolidated net revenues	(54,900)		(42,866)		(101,905)	(88,888)
Consolidated material costs	(54,900)		(42,866)		(101,905)	(88,888)
Patient Care
Segment and Related Information
Income (loss) from operations	39,640		58,619		58,690	70,156
Consolidated net revenues	236,787		195,859		432,469	386,042
Consolidated material costs	71,717		55,236		131,639	114,913
Patient Care | Operating segments
Segment and Related Information
Consolidated net revenues	236,787		195,859		432,469	386,042
Consolidated material costs	62,631		50,489		114,290	103,613
Products and Services
Segment and Related Information
Income (loss) from operations	3,401		5,758		8,077	7,838
Consolidated net revenues	98,932		80,441		187,725	170,019
Consolidated material costs	72,454		57,602		134,707	121,188
Products and Services | Operating segments
Segment and Related Information
Consolidated net revenues	44,032		37,575		85,820	81,131
Consolidated material costs	$ 26,640		$ 19,483		$ 50,151	$ 43,600