CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 111,353	$ 121,988
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	85,301	80,883
Expenses associated with debt refinancing transactions	1,996
Amortization of debt issuance costs and other non-cash interest	3,280	3,234
Deferred income taxes	3,585	16,389
Income tax benefit of equity compensation	(2,291)	(1,889)
Non-cash equity compensation	9,116	7,788
Other expenses and non-cash items	662	1,327
Changes in assets and liabilities, net:
Accounts receivable, prepaid expenses and other assets	28,916	47,439
Accounts payable, accrued expenses and other liabilities	(20,161)	(20,221)
Income taxes payable	1,294	1,060
Net cash provided by operating activities	223,051	257,998
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for facility development and expansions	(25,427)	(37,602)
Expenditures for other capital improvements	(35,738)	(30,331)
Decrease in restricted cash		1,749
Proceeds from sale of assets	496	829
Increase in other assets	(2,787)	(1,752)
Payments received on direct financing lease	1,156	1,024
Net cash used in investing activities	(62,300)	(66,083)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of debt	808,500	273,623
Principal repayments of debt	(923,500)	(221,589)
Payment of debt issuance and other refinancing and related costs	(6,328)
Income tax benefit of equity compensation	2,291	1,889
Purchase and retirement of common stock	(2,481)	(225,300)
Proceeds from exercise of stock options	4,015	1,911
Dividends paid	(39,838)
Net cash used in financing activities	(157,341)	(169,466)
NET INCREASE IN CASH AND CASH EQUIVALENTS	3,410	22,449
CASH AND CASH EQUIVALENTS, beginning of period	55,832	25,509
CASH AND CASH EQUIVALENTS, end of period	59,242	47,958
Cash paid during the period for:
Interest (net of amounts capitalized of $837 and $894 in 2012 and 2011, respectively)	44,978	52,823
Income taxes	$ 59,645	$ 58,092