Segment and Related Information - Reconciliation of the reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment and Related Information
Income from operations	$ 20,787		$ 20,094		$ 18,242	$ 22,115
Interest expense, net	7,524		7,152		14,909	14,492
Non-service defined benefit plan expense	160		167		320	334
Income before income taxes	13,103		12,775		3,013	7,289
Provision for income taxes	2,986		2,616		873	460
Net income	10,117	$ (7,977)	10,159	$ (3,330)	2,140	6,829
Consolidated net revenues	312,033		280,819		573,320	518,289
Consolidated material costs	98,433		89,271		184,025	164,441
Corporate & other
Segment and Related Information
Income from operations	(24,279)		(22,947)		(46,324)	(44,652)
Consolidated net revenues	0		0		0	0
Consolidating adjustments
Segment and Related Information
Consolidated net revenues	(63,433)		(54,900)		(118,108)	(101,905)
Patient Care
Segment and Related Information
Income from operations	40,538		39,640		57,531	58,690
Consolidated net revenues	265,670		236,787		485,488	432,469
Consolidated material costs	82,085		71,717		153,061	131,639
Patient Care | Operating Segments
Segment and Related Information
Income from operations	40,538		39,640		57,531	58,690
Consolidated net revenues	265,670		236,787		485,488	432,469
Consolidated material costs	71,623		62,631		131,541	114,290
Products & Services
Segment and Related Information
Income from operations	4,528		3,401		7,035	8,077
Consolidated net revenues	109,796		98,932		205,940	187,725
Consolidated material costs	79,781		72,454		149,072	134,707
Products & Services | Operating Segments
Segment and Related Information
Income from operations	4,528		3,401		7,035	8,077
Consolidated net revenues	46,363		44,032		87,832	85,820
Consolidated material costs	$ 26,810		$ 26,640		$ 52,484	$ 50,151