Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue Recognition
Net revenues	$ 289,827	$ 256,637	$ 808,116	$ 723,810
Patient Care
Revenue Recognition
Net revenues	244,356	212,664	676,825	598,706
Patient Care | Operating Segments
Revenue Recognition
Net revenues	244,356	212,664	676,825	598,706
Patient Care | Medicare | Operating Segments
Revenue Recognition
Net revenues	79,586	68,135	211,169	194,052
Patient Care | Medicaid | Operating Segments
Revenue Recognition
Net revenues	42,739	34,541	120,475	96,612
Patient Care | Commercial Insurance / Managed Care (excluding Medicare and Medicaid Managed Care) | Operating Segments
Revenue Recognition
Net revenues	83,396	75,966	232,828	213,234
Patient Care | Veterans Administration | Operating Segments
Revenue Recognition
Net revenues	22,901	19,339	64,298	54,057
Patient Care | Private Pay | Operating Segments
Revenue Recognition
Net revenues	15,734	14,683	48,055	40,751
Products & Services
Revenue Recognition
Net revenues	103,966	93,984	292,277	264,003
Products & Services | Operating Segments
Revenue Recognition
Net revenues	45,471	43,973	131,291	125,104
Products & Services | Distribution services, net of intersegment revenue eliminations | Operating Segments
Revenue Recognition
Net revenues	34,656	32,711	98,591	90,928
Products & Services | Therapeutic solutions | Operating Segments
Revenue Recognition
Net revenues	$ 10,815	$ 11,262	$ 32,700	$ 34,176