BASIS OF PRESENTATION - Schedule of Outstanding Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 209,873	$ 190,023
Allowance for doubtful accounts	(39,240)	(17,836)
Net accounts receivable	170,633	172,187
Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	41,790	35,486
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	151,916	149,635
Patient
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	16,167	4,902
0-180 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	149,908	153,074
0-180 days | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	28,158	27,622
0-180 days | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	116,846	122,660
0-180 days | Patient
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	4,904	2,792
Over 180 days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	59,965	36,949
Over 180 days | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	13,632	7,864
Over 180 days | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	35,070	26,975
Over 180 days | Patient
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 11,263	$ 2,110