CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net income	$ 19,728	$ 17,158
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,954	9,448
Provision for doubtful accounts	10,992	8,193
Non-cash compensation	8,230	7,806
401(k) employer match	4,367	3,440
Loss on disposal of property and equipment	147	522
Deferred income taxes	7,582	11,362
Equity in earnings of equity method investments	(2,249)	(358)
Amortization of deferred debt issuance costs	370	370
Return on equity investment	3,416	362
Changes in operating assets and liabilities, net of impact of acquisitions:
Patient accounts receivable	(17,825)	(30,349)
Other current assets	(6,892)	5,551
Other assets	(1,148)	(11,943)
Accounts payable	1,093	8,608
Securities Class Action Lawsuit settlement accrual, net	28,712	0
Accrued expenses	(2,743)	(2,811)
Other long-term obligations	607	(464)
Net cash provided by operating activities	63,341	26,895
Cash Flows from Investing Activities:
Proceeds from sale of deferred compensation plan assets	565	230
Purchase of investment	(436)	(432)
Purchases of property and equipment	(7,449)	(9,915)
Acquisitions of businesses, net of cash acquired	(24,128)	(27,634)
Net cash used in investing activities	(31,448)	(37,751)
Cash Flows from Financing Activities:
Proceeds from issuance of stock upon exercise of stock options and warrants	4,203	0
Proceeds from issuance of stock to employee stock purchase plan	1,187	1,207
Shares withheld upon stock vesting	(5,726)	0
Tax benefit from stock options exercised and restricted stock vesting	0	7,130
Non-controlling interest distribution	(90)	(200)
Proceeds from revolving line of credit	0	84,000
Repayments of revolving line of credit	0	(84,000)
Principal payments of long-term obligations	(2,500)	(2,500)
Purchase of company stock	0	(12,315)
Net cash used in financing activities	(2,926)	(6,678)
Net increase (decrease) in cash and cash equivalents	28,967	(17,534)
Cash and cash equivalents at beginning of period	30,197	27,502
Cash and cash equivalents at end of period	59,164	9,968
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	1,172	1,359
Cash paid for income taxes, net of refunds received	$ 284	$ 825