Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUE RECOGNITION
Net revenues	$ 281,098	$ 266,966	$ 517,517	$ 500,961
Patient Care
REVENUE RECOGNITION
Net revenues	231,168	218,158	421,769	406,665
Patient Care | Medicare
REVENUE RECOGNITION
Net revenues	75,640	70,469	133,416	127,781
Patient Care | Medicaid
REVENUE RECOGNITION
Net revenues	37,344	33,648	67,491	63,400
Patient Care | Commercial Insurance/ Managed Care (excluding Medicare and Medicaid Managed Care)
REVENUE RECOGNITION
Net revenues	78,808	77,621	149,026	148,432
Patient Care | Veterans Administration
REVENUE RECOGNITION
Net revenues	22,497	20,904	40,819	37,547
Patient Care | Private Pay
REVENUE RECOGNITION
Net revenues	16,879	15,516	31,017	29,505
Patient Care | Operating segments
REVENUE RECOGNITION
Net revenues	231,168	218,158	421,769	406,665
Products & Services
REVENUE RECOGNITION
Net revenues	101,626	98,643	192,323	186,653
Products & Services | Operating segments
REVENUE RECOGNITION
Net revenues	49,930	48,808	95,748	94,296
Products & Services | Operating segments | Distribution services, net of intersegment revenue eliminations
REVENUE RECOGNITION
Net revenues	37,662	34,684	70,857	66,035
Products & Services | Operating segments | Therapeutic solutions
REVENUE RECOGNITION
Net revenues	$ 12,268	$ 14,124	$ 24,891	$ 28,261