Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net earnings (loss)	$ 128,109	$ 110,484
Adjustments to reconcile net earnings to net cash flows provided by operating activities:
Depreciation and amortization	16,269	14,770
Net (gain) loss on sale of long-lived assets	0	599
Gain (loss) on deconsolidation	(2,237)	0
Share-based compensation	3,966	3,412
Excess tax benefit from share-based compensation	(1,210)	(529)
Deferred income taxes	19,329	13,388
Equity in earnings of unconsolidated affiliates, net	(1,098)	(711)
Increase (decrease) in cash and cash equivalents, net of effects of acquisitions and dispositions, due to changes in:
Accounts receivable, net	(5,221)	2,935
Supplies inventory	(320)	333
Prepaid and other current assets	(2,057)	(331)
Accounts payable	(2,351)	901
Accrued expenses and other liabilities	(2,155)	(2,616)
Other, net	1,526	989
Net cash flows provided by operating activities	152,550	143,624
Cash flows from investing activities:
Acquisition of interests in surgery centers and related transactions	(18,346)	(9,972)
Acquisition of property and equipment	(12,472)	(14,569)
Other	55	0
Net cash flows used in investing activities	(30,763)	(24,541)
Cash flows from financing activities:
Proceeds from long-term borrowings	70,922	33,378
Repayment on long-term borrowings	(96,222)	(72,517)
Distributions to noncontrolling interests	(91,526)	(82,759)
Proceeds from issuance of common stock upon exercise of stock options	13,728	6,672
Repurchase of common stock	(26,164)	(7,219)
Capital contributions and ownership transactions by noncontrolling interests	936	1,519
Excess tax benefit from share-based compensation	1,210	529
Financing cost incurred	(1,146)	(1,755)
Net cash flows provided by (used in) financing activities	(128,262)	(122,152)
Net increase (decrease) in cash and cash equivalents	(6,475)	(3,069)
Cash and cash equivalents, beginning of period	46,398	40,718
Cash and cash equivalents, end of period	$ 39,923	$ 37,649