BASIS OF PRESENTATION Schedule of Outstanding Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	$ 203,803	$ 207,310
Allowance for doubtful accounts	(72,332)	(66,500)
Net accounts receivable	131,471	140,810
Government
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	37,820	38,848
Commercial
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	147,547	153,001
Patient
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	18,436	15,461
0-180 days
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	144,219	148,410
0-180 days | Government
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	24,706	25,812
0-180 days | Commercial
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	112,593	117,699
0-180 days | Patient
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	6,920	4,899
Over 180 days
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	59,584	58,900
Over 180 days | Government
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	13,114	13,036
Over 180 days | Commercial
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	34,954	35,302
Over 180 days | Patient
Change in Estimate of the Collectability of Accounts Receivable
Gross accounts receivable	$ 11,516	$ 10,562