ACCOUNTS RECEIVABLE, NET - Allowances (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable, net
Accounts receivable, before allowance	$ 271,384				$ 213,488
Allowance for disallowed revenue	(87,192)				(52,277)				$ (31,447)	$ (31,136)
Accounts receivable, gross	184,192				161,211
Allowance for doubtful accounts	(9,944)	$ (10,197)	$ (9,078)	$ (7,920)	(6,472)	$ (5,837)	$ (4,971)	$ (4,941)	$ (4,928)	$ (3,844)
Accounts receivable, net	174,248	$ 165,787	$ 159,471	$ 146,060	154,739	$ 149,952	$ 150,276	$ 139,756
Patient Care
Accounts Receivable, net
Accounts receivable, before allowance	249,248				195,107
Allowance for disallowed revenue	(87,192)				(52,277)
Accounts receivable, gross	162,056				142,830
Allowance for doubtful accounts	(8,285)				(5,127)
Accounts receivable, net	153,771				137,703
Products and Services
Accounts Receivable, net
Accounts receivable, before allowance	22,136				18,381
Accounts receivable, gross	22,136				18,381
Allowance for doubtful accounts	(1,659)				(1,345)
Accounts receivable, net	$ 20,477				$ 17,036