CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income (loss)	$ 37,631	$ (2,312)	$ 13,089
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	19,678	20,036	28,347
Provision for doubtful accounts	19,519	14,053	16,369
Non-cash compensation	16,401	11,824	5,597
401(k) employer match	6,875	6,089	6,216
Write-off of investment	196	0	0
Loss on disposal of property and equipment	582	775	4,592
Gain on sale of care centers	0	(184)	(2,967)
Deferred income taxes	24,547	(677)	22,561
Write off of deferred debt issuance costs/debt discount	0	2,512	488
Equity in earnings from equity method investments	(5,588)	(9,823)	(2,991)
Amortization of deferred debt issuance costs/debt discount	740	959	797
Return on equity investment	4,323	5,610	2,025
Asset impairment charge	4,432	77,268	3,107
Changes in operating assets and liabilities, net of impact of acquisitions:
Patient accounts receivable	(55,519)	(36,493)	(5,290)
Other current assets	4,231	6,455	(6,269)
Other assets	(11,415)	(3,523)	1,694
Accounts payable	3,970	7,639	(3,168)
U.S. Department of Justice settlement	0	0	(150,000)
Accrued expenses	(7,618)	8,406	3,495
Other long-term obligations	(726)	(829)	(3,226)
Net cash provided by (used in) operating activities	62,259	107,785	(65,534)
Cash Flows from Investing Activities:
Proceeds from sale of deferred compensation plan assets	230	1,229	11
Proceeds from the sale of property and equipment	0	20,000	3
Purchases of deferred compensation plan assets	0	(19)	(132)
Purchases of property and equipment	(15,717)	(21,429)	(12,008)
Purchase of investments	(1,040)	(3,485)	(6,407)
Proceeds from sale of investment	0	5,000	0
Acquisitions of businesses, net of cash acquired	(35,522)	(69,130)	0
Proceeds from disposition of care centers	0	413	4,233
Net cash used in investing activities	(52,049)	(67,421)	(14,300)
Cash Flows from Financing Activities:
Proceeds from issuance of stock upon exercise of stock options and warrants	0	399	564
Proceeds from issuance of stock to employee stock purchase plan	2,483	2,204	2,433
Tax benefit from stock options exercised and restricted stock vesting	7,241	2,073	0
Non-controlling interest distribution	(329)	(436)	0
Proceeds from revolving line of credit	134,500	63,400	241,800
Repayments of revolving line of credit	(134,500)	(78,400)	(226,800)
Proceeds from issuance of long-term obligations	0	100,000	68,250
Principal payments of long-term obligations	(5,000)	(103,000)	(13,904)
Debt issuance costs	0	(2,553)	(1,780)
Purchase of company stock	(12,315)	(4,581)	0
Assets contributed to equity investment	405	0	0
Net cash (used in) provided by financing activities	(7,515)	(20,894)	70,563
Net increase (decrease) in cash and cash equivalents	2,695	19,470	(9,271)
Cash and cash equivalents at beginning of period	27,502	8,032	17,303
Cash and cash equivalents at end of period	30,197	27,502	8,032
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	2,897	6,175	7,602
Cash paid for income taxes, net of refunds received	755	(12,185)	(1,766)
Supplemental Disclosures of Non-Cash Financing and Investing Activities
(Sale) acquistion of noncontrolling interests	$ 0	$ 0	$ (1,549)