CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash Flows from Operating Activities:
Net income	$ 13,429	$ 37,035
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,071	19,081
Provision for doubtful accounts	10,621	5,290
Non-cash compensation	4,780	5,115
401(k) employer match	5,040	3,332
Loss on disposal of property and equipment	848	1,313
Deferred income taxes	8,474	3,708
Equity in earnings of equity investments	(701)	(789)
Amortization of deferred debt issuance costs	788	788
Return on equity investment	625	540
Changes in operating assets and liabilities, net of impact of acquisitions:
Patient accounts receivable	(25,722)	(3,320)
Other current assets	411	10,117
Other assets	(545)	(6,364)
Accounts payable	1,457	(357)
Accrued expenses	(3,976)	2,398
Other long-term obligations	(578)	(1,374)
Net cash provided by operating activities	35,022	76,513
Cash Flows from Investing Activities:
Proceeds from sale of deferred compensation plan assets	239	853
Proceeds from the sale of property and equipment	590
Purchases of deferred compensation plan assets	(127)	(379)
Purchases of property and equipment	(20,241)	(26,032)
Acquisitions of businesses, net of cash acquired	(8,392)	(125,977)
Net cash used in investing activities	(27,931)	(151,535)
Cash Flows from Financing Activities:
Proceeds from issuance of stock upon exercise of stock options and warrants	145	236
Proceeds from issuance of stock to employee stock purchase plan	1,978	2,731
Tax benefit from stock option exercises	(2,917)	(334)
Non-controlling interest distribution	(105)	(198)
Principal payments of long-term obligations	(17,038)	(19,576)
Net cash used in financing activities	(17,937)	(17,141)
Net decrease in cash and cash equivalents	(10,846)	(92,163)
Cash and cash equivalents at beginning of period	48,004	120,295
Cash and cash equivalents at end of period	37,158	28,132
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	3,494	3,656
Cash paid for income taxes, net of refunds received	$ 1,470	$ 6,273