Segment and Related Information - Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net revenue
Net revenues	$ 289,827	$ 256,637	$ 808,116	$ 723,810
Material costs	92,561	81,462	257,002	228,675
Personnel expenses	98,948	89,727	286,377	252,734
Depreciation & amortization	8,159	8,803	24,164	26,513
Income from operations	25,668	13,075	47,783	42,763
Patient Care
Net revenue
Net revenues	244,356	212,664	676,825	598,706
Material costs	74,764	63,938	206,403	178,851
Personnel expenses	84,479	76,989	243,431	216,910
Other expenses	38,923	34,713	112,509	86,462
Depreciation & amortization	4,870	4,786	14,472	14,089
Income from operations	41,320	32,238	100,010	102,394
Patient Care | Operating Segments
Net revenue
Net revenues	244,356	212,664	676,825	598,706
Material costs	65,356	56,599	179,060	160,212
Income from operations	41,320	32,238	100,010	102,394
Patient Care | Intersegment Eliminations
Net revenue
Net revenues	0	0	0	0
Material costs	9,408	7,339	27,343	18,639
Products & Services
Net revenue
Net revenues	103,966	93,984	292,277	264,003
Material costs	76,292	67,535	211,585	188,723
Personnel expenses	14,469	12,738	42,946	35,824
Other expenses	6,636	5,957	19,202	18,614
Depreciation & amortization	1,974	2,633	5,872	7,883
Income from operations	4,595	5,121	12,672	12,959
Products & Services | Operating Segments
Net revenue
Net revenues	45,471	43,973	131,291	125,104
Material costs	27,205	24,863	77,942	68,463
Income from operations	4,595	5,121	12,672	12,959
Products & Services | Intersegment Eliminations
Net revenue
Net revenues	58,495	50,011	160,986	138,899
Material costs	$ 49,087	$ 42,672	$ 133,643	$ 120,260