CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net (loss) income	$ (2,312)	$ 13,089	$ (97,775)
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization	20,036	28,347	37,383
Provision for doubtful accounts	14,053	16,369	16,461
Non-cash compensation	11,824	5,597	6,519
401(k) employer match	6,089	6,216	7,998
Loss on disposal of property and equipment	775	4,592	2,742
Gain on sale of care centers	(184)	(2,967)	(1,752)
Deferred income taxes	(677)	22,561	(57,095)
Write off of deferred debt issuance costs/debt discount	2,512	488	121
Equity in earnings from equity method investments	(9,823)	(2,991)	(1,520)
Amortization of deferred debt issuance costs/debt discount	959	797	699
Return on equity investment	5,610	2,025	1,650
Asset impairment charge	77,268	3,107	9,492
Changes in operating assets and liabilities, net of impact of acquisitions:
Patient accounts receivable	(36,493)	(5,290)	41,578
Other current assets	6,455	(6,269)	(501)
Other assets	(3,523)	1,694	(1,596)
Accounts payable	7,639	(3,168)	(9,876)
U.S. Department of Justice settlement	0	(150,000)	150,000
Accrued expenses	8,406	3,495	(6,104)
Other long-term obligations	(829)	(3,226)	3,839
Net cash provided by (used in) operating activities	107,785	(65,534)	102,263
Cash Flows from Investing Activities:
Proceeds from sale of deferred compensation plan assets	1,229	11	128
Proceeds from the sale of property and equipment	20,000	3	1,809
Purchases of deferred compensation plan assets	(19)	(132)	(111)
Purchases of property and equipment	(21,429)	(12,008)	(41,736)
Purchase of investments	(3,485)	(6,407)	(10,067)
Proceeds from sale of investment	5,000	0	0
Acquisitions of businesses, net of cash acquired	(69,130)	0	(1,627)
Proceeds from disposition of care centers	413	4,233	5,146
Net cash used in investing activities	(67,421)	(14,300)	(46,458)
Cash Flows from Financing Activities:
Proceeds from issuance of stock upon exercise of stock options and warrants	399	564	261
Proceeds from issuance of stock to employee stock purchase plan	2,204	2,433	3,181
Tax benefit from stock options exercised and restricted stock vesting	2,073	0	57
Non-controlling interest distribution	(436)	0	(163)
Proceeds from revolving line of credit	63,400	241,800	25,500
Repayments of revolving line of credit	(78,400)	(226,800)	(25,500)
Proceeds from issuance of long-term obligations	100,000	68,250	0
Debt issuance costs	(2,553)	(1,780)	(576)
Principal payments of long-term obligations	(103,000)	(13,904)	(55,807)
Purchase of company stock	(4,581)	0	0
Net cash (used in) provided by financing activities	(20,894)	70,563	(53,047)
Net increase (decrease) in cash and cash equivalents	19,470	(9,271)	2,758
Cash and cash equivalents at beginning of period	8,032	17,303	14,545
Cash and cash equivalents at end of period	27,502	8,032	17,303
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	6,175	7,602	3,990
Cash paid for income taxes, net of refunds received	(12,185)	(1,766)	3,385
Supplemental Disclosures of Non-Cash Financing and Investing Activities
(Sale) acquistion of noncontrolling interests	$ 0	$ (1,549)	$ 145