Segment and Related Information - Financial information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net revenue
Net revenues	$ 312,033	$ 280,819	$ 573,320	$ 518,289
Material costs	98,433	89,271	184,025	164,441
Personnel expenses	110,275	97,549	211,950	187,429
Depreciation & amortization	8,124	8,007	16,079	16,005
Income from operations	20,787	20,094	18,242	22,115
Patient Care
Net revenue
Net revenues	265,670	236,787	485,488	432,469
Material costs	82,085	71,717	153,061	131,639
Personnel expenses	93,838	83,198	180,247	158,952
Other expenses	44,426	37,445	85,122	73,586
Depreciation & amortization	4,783	4,787	9,527	9,602
Income from operations	40,538	39,640	57,531	58,690
Patient Care | Operating Segments
Net revenue
Net revenues	265,670	236,787	485,488	432,469
Material costs	71,623	62,631	131,541	114,290
Income from operations	40,538	39,640	57,531	58,690
Patient Care | Intersegment Eliminations
Net revenue
Net revenues	0	0	0	0
Material costs	10,462	9,086	21,520	17,349
Products & Services
Net revenue
Net revenues	109,796	98,932	205,940	187,725
Material costs	79,781	72,454	149,072	134,707
Personnel expenses	16,437	14,351	31,703	28,477
Other expenses	6,871	6,763	13,928	12,566
Depreciation & amortization	2,179	1,963	4,202	3,898
Income from operations	4,528	3,401	7,035	8,077
Products & Services | Operating Segments
Net revenue
Net revenues	46,363	44,032	87,832	85,820
Material costs	26,810	26,640	52,484	50,151
Income from operations	4,528	3,401	7,035	8,077
Products & Services | Intersegment Eliminations
Net revenue
Net revenues	63,433	54,900	118,108	101,905
Material costs	$ 52,971	$ 45,814	$ 96,588	$ 84,556