Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 136,700	$ 159,230
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	109,564	127,328
Asset impairments	614
Amortization of debt issuance costs and other non-cash interest	2,349	2,362
Deferred income taxes	(1,725)	(2,149)
Non-cash revenue and other income	(10,210)	(4,522)
Income tax benefit of equity compensation		(1,492)
Non-cash equity compensation	12,203	14,029
Other expenses and non-cash items	2,975	3,636
Changes in assets and liabilities, net:
Accounts receivable, prepaid expenses and other assets	(899)	20,680
Accounts payable, accrued expenses and other liabilities	13,482	(19,114)
Income taxes payable	(918)	1,199
Net cash provided by operating activities	264,135	301,187
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for facility development and expansions	(16,543)	(30,885)
Expenditures for other capital improvements	(35,214)	(32,774)
Acquisitions, net of cash acquired	(29,174)	(43,769)
Decrease in restricted cash		240
Proceeds from sale of assets	931	8,192
Increase in other assets	(2,444)	1,158
Payments received on direct financing lease and notes receivable	684	1,875
Net cash used in investing activities	(81,760)	(95,963)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of debt and borrowings from credit facility	197,500	291,250
Scheduled principal repayments	(7,500)	(3,750)
Other principal repayments of debt	(215,500)	(312,250)
Payment of debt issuance and other refinancing and related costs	(65)	(68)
Payment of lease obligations	(1,791)	(10,561)
Contingent consideration for acquisition of businesses		(1,073)
Dividends paid	(150,691)	(192,021)
Income tax benefit of equity compensation		1,492
Purchase and retirement of common stock	(5,818)	(3,991)
Decrease in restricted cash for dividends		550
Proceeds from exercise of stock options	6,514	2,638
Net cash used in financing activities	(177,351)	(227,784)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	5,024	(22,560)
CASH AND CASH EQUIVALENTS, beginning of period	37,711	65,291
CASH AND CASH EQUIVALENTS, end of period	42,735	42,731
Cash paid during the period for:
Interest (net of amounts capitalized of $0 and $378 in 2017 and 2016, respectively)	40,130	38,226
Income taxes paid (refunded), net	$ 5,015	$ (2,162)