Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
REVENUE RECOGNITION
Net revenues	$ 279,638	$ 262,946	$ 797,155	$ 763,907
Patient Care
REVENUE RECOGNITION
Net revenues	230,931	214,080	652,700	620,745
Patient Care | Medicare
REVENUE RECOGNITION
Net revenues	72,879	69,724	206,295	197,461
Patient Care | Medicaid
REVENUE RECOGNITION
Net revenues	36,140	33,597	103,631	96,993
Patient Care | Commercial Insurance/ Managed Care (excluding Medicare and Medicaid Managed Care)
REVENUE RECOGNITION
Net revenues	83,384	78,333	232,410	226,761
Patient Care | Veterans Administration
REVENUE RECOGNITION
Net revenues	23,816	19,317	64,635	56,873
Patient Care | Private Pay
REVENUE RECOGNITION
Net revenues	14,712	13,109	45,729	42,657
Patient Care | Operating segments
REVENUE RECOGNITION
Net revenues	230,931	214,080	652,700	620,745
Products & Services
REVENUE RECOGNITION
Net revenues	102,377	97,811	294,700	284,464
Products & Services | Operating segments
REVENUE RECOGNITION
Net revenues	48,707	48,866	144,455	143,162
Products & Services | Operating segments | Distribution services, net of intersegment revenue eliminations
REVENUE RECOGNITION
Net revenues	36,653	34,666	107,510	100,700
Products & Services | Operating segments | Therapeutic solutions
REVENUE RECOGNITION
Net revenues	$ 12,054	$ 14,200	$ 36,945	$ 42,462