ACCOUNTS RECEIVABLE, NET - (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Receivable, net
Accounts receivable, before allowances	$ 198,584	$ 216,644
Allowances for estimated implicit price concessions arising from:
Payor disallowances	(52,428)	(56,233)
Patient non-payments	(8,335)
Accounts receivable, gross	137,821	160,411
Allowance for doubtful accounts	(3,742)	(14,065)
Accounts receivable, net	134,079	146,346
Patient Care
Accounts Receivable, net
Accounts receivable, before allowances	173,268	193,150
Allowances for estimated implicit price concessions arising from:
Payor disallowances	(52,428)	(56,233)
Patient non-payments	(8,335)
Accounts receivable, gross	112,505	136,917
Allowance for doubtful accounts		(9,894)
Accounts receivable, net	112,505	127,023
Products & Services
Accounts Receivable, net
Accounts receivable, before allowances	25,316	23,494
Allowances for estimated implicit price concessions arising from:
Accounts receivable, gross	25,316	23,494
Allowance for doubtful accounts	(3,742)	(4,171)
Accounts receivable, net	$ 21,574	$ 19,323