Segment and Related Information - Reconciliation of the Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment and Related Information
Operating Income (Loss)	$ 25,668			$ 13,075			$ 47,783	$ 42,763
Interest expense, net	7,313			8,013			21,805	24,918
Non-service defined benefit plan expense	167			158			501	474
Income before income taxes	18,188			4,904			25,477	17,371
Benefit for income taxes	(2,929)			(1,911)			(2,469)	(4,750)
Net income	21,117	$ 10,159	$ (3,330)	6,815	$ 31,054	$ (15,748)	27,946	22,121
Consolidated net revenues	289,827			256,637			808,116	723,810
Consolidated material costs	92,561			81,462			257,002	228,675
Corporate & other
Segment and Related Information
Operating Income (Loss)	(20,247)			(24,284)			(64,899)	(72,590)
Consolidating adjustments
Segment and Related Information
Consolidated net revenues	(58,495)			(50,011)			(160,986)	(138,899)
Consolidated material costs	(58,495)			(50,011)			(160,986)	(138,899)
Patient Care
Segment and Related Information
Operating Income (Loss)	41,320			32,238			100,010	102,394
Consolidated net revenues	244,356			212,664			676,825	598,706
Consolidated material costs	74,764			63,938			206,403	178,851
Patient Care | Operating Segments
Segment and Related Information
Operating Income (Loss)	41,320			32,238			100,010	102,394
Consolidated net revenues	244,356			212,664			676,825	598,706
Consolidated material costs	65,356			56,599			179,060	160,212
Products & Services
Segment and Related Information
Operating Income (Loss)	4,595			5,121			12,672	12,959
Consolidated net revenues	103,966			93,984			292,277	264,003
Consolidated material costs	76,292			67,535			211,585	188,723
Products & Services | Operating Segments
Segment and Related Information
Operating Income (Loss)	4,595			5,121			12,672	12,959
Consolidated net revenues	45,471			43,973			131,291	125,104
Consolidated material costs	$ 27,205			$ 24,863			$ 77,942	$ 68,463