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 income	$ 201,521	$ 69,014
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	55,727	56,689
Expenses associated with debt refinancing transactions	36,528	1,828
Asset impairments	2,637
Amortization of debt issuance costs and other non-cash interest	1,966	2,224
Deferred income taxes	(145,955)	2,667
Income tax benefit of equity compensation	(31)	(2,282)
Non-cash equity compensation	6,411	5,903
Other expenses and non-cash items	753	926
Changes in assets and liabilities, net:
Accounts receivable, prepaid expenses and other assets	17,489	15,008
Accounts payable, accrued expenses and other liabilities	5,232	(23,332)
Income taxes payable	581	1,367
Net cash provided by operating activities	182,859	130,012
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for facility development and expansions	(10,827)	(16,843)
Expenditures for other capital improvements	(16,113)	(25,520)
Increase in restricted cash	(649)
Proceeds from sale of assets	57	495
Increase in other assets	(2,063)	(2,246)
Payments received on direct financing lease	857	759
Net cash used in investing activities	(28,738)	(43,355)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of debt	983,000	758,500
Principal repayments of debt	(953,000)	(813,500)
Payment of debt issuance and other refinancing and related costs	(37,203)	(6,327)
Income tax benefit of equity compensation	31	2,282
Purchase and retirement of common stock	(5,454)	(2,481)
Proceeds from exercise of stock options	22,094	2,078
Dividends paid	(188,611)	(19,911)
Net cash used in financing activities	(179,143)	(79,359)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(25,022)	7,298
CASH AND CASH EQUIVALENTS, beginning of period	62,897	55,832
CASH AND CASH EQUIVALENTS, end of period	37,875	63,130
Cash paid during the period for:
Interest (net of amounts capitalized of $301 and $635 in 2013 and 2012, respectively)	19,633	38,606
Income taxes	$ 3,730	$ 38,998