Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Recognition
Net revenues	$ 277,340	$ 256,637	$ 233,434	$ 233,739	$ 300,891	$ 279,638	$ 281,098	$ 236,419	$ 1,001,150	$ 1,098,046	$ 1,048,760
Patient Care
Revenue Recognition
Net revenues									831,603	905,691	857,382
Patient Care | Medicare
Revenue Recognition
Net revenues									268,226	289,099	273,833
Patient Care | Medicaid
Revenue Recognition
Net revenues									135,134	143,438	132,938
Patient Care | Commercial Insurance / Managed Care (excluding Medicare and Medicaid Managed Care)
Revenue Recognition
Net revenues									296,738	323,499	316,243
Patient Care | Veterans Administration
Revenue Recognition
Net revenues									76,769	89,035	78,328
Patient Care | Private Pay
Revenue Recognition
Net revenues									54,736	60,620	56,040
Patient Care | Operating segments
Revenue Recognition
Net revenues									831,603	905,691	857,382
Products & Services
Revenue Recognition
Net revenues									359,151	395,851	383,474
Products & Services | Operating segments
Revenue Recognition
Net revenues									169,547	192,355	191,378
Products & Services | Operating segments | Distribution services, net of intersegment revenue eliminations
Revenue Recognition
Net revenues									124,045	143,400	135,995
Products & Services | Operating segments | Therapeutic solutions
Revenue Recognition
Net revenues									$ 45,502	$ 48,955	$ 55,383