Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 165,016	$ 253,364
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	85,413	84,002
Expenses associated with debt refinancing transactions		36,528
Asset impairments	2,238	3,622
Amortization of debt issuance costs and other non-cash interest	2,325	2,740
Deferred income taxes	(3,648)	(146,881)
Non-cash revenue and other income	(3,384)
Income tax benefit of equity compensation	(222)	(40)
Non-cash equity compensation	10,438	9,695
Other expenses and non-cash items	3,603	1,608
Changes in assets and liabilities, net:
Accounts receivable, prepaid expenses and other assets	16,366	33,634
Accounts payable, accrued expenses and other liabilities	(29,324)	4,430
Income taxes payable	(132)	902
Net cash provided by operating activities	248,689	283,604
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for facility development and expansions	(47,178)	(18,292)
Acquisition of businesses, net of cash acquired		(36,249)
Expenditures for other capital improvements	(31,545)	(27,482)
Capitalized lease payment	(70,000)
Decrease in restricted cash	2,983
Proceeds from sale of assets	806	443
Decrease (increase) in other assets	1,967	(2,367)
Payments received on direct financing lease and notes receivable	1,473	1,379
Net cash used in investing activities	(141,494)	(82,568)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of debt	185,000	1,183,000
Principal repayments of debt	(150,000)	(1,118,000)
Payment of debt issuance and other refinancing and related costs		(37,242)
Income tax benefit of equity compensation	222	40
Purchase and retirement of common stock	(3,052)	(5,454)
Proceeds from exercise of stock options	6,349	28,538
Increase in restricted cash for dividends	(100)	(810)
Dividends paid	(174,686)	(243,782)
Net cash used in financing activities	(136,267)	(193,710)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(29,072)	7,326
CASH AND CASH EQUIVALENTS, beginning of period	77,919	62,897
CASH AND CASH EQUIVALENTS, end of period	48,847	70,223
Cash paid during the period for:
Interest (net of amounts capitalized of $1,664 and $504 in 2014 and 2013, respectively)	22,525	22,312
Income taxes	$ 14,299	$ 6,066