Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 103,890	$ 122,580
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	84,404	67,085
Asset impairments		955
Amortization of debt issuance costs and other non-cash interest	1,577	1,552
Deferred income taxes	2,050	2,611
Non-cash revenue and other income	(2,204)	(991)
Income tax benefit of equity compensation	(25)	(475)
Non-cash equity compensation	7,873	7,708
Other expenses and non-cash items	2,192	2,213
Changes in assets and liabilities, net:
Accounts receivable, prepaid expenses and other assets	22,079	6,124
Accounts payable, accrued expenses and other liabilities	(7,754)	5,692
Income taxes payable	(756)	193
Net cash provided by operating activities	213,326	215,247
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for facility development and expansions	(18,725)	(112,548)
Expenditures for other capital improvements	(20,695)	(25,889)
Capitalized lease payments		(24,592)
Acquisition of businesses, net of cash acquired	(43,618)
Decrease in restricted cash	240	603
Proceeds from sale of assets	8,192	57
Decrease in other assets	833	1,922
Payments received on direct financing lease and notes receivable	1,231	1,091
Net cash used in investing activities	(72,542)	(159,356)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of debt	201,000	160,000
Principal repayments of debt	(198,500)	(122,000)
Payment of debt issuance and other refinancing and related costs	(68)	(134)
Payment of lease obligations	(6,702)
Contingent consideration for acquisition of businesses	(1,073)
Dividends paid	(128,550)	(124,261)
Income tax benefit of equity compensation	25	475
Purchase and retirement of common stock	(3,947)	(9,432)
Decrease in restricted cash for dividends	550	500
Proceeds from exercise of stock options	2,033	5,637
Net cash used in financing activities	(135,232)	(89,215)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	5,552	(33,324)
CASH AND CASH EQUIVALENTS, beginning of period	65,291	74,393
CASH AND CASH EQUIVALENTS, end of period	70,843	41,069
Cash paid during the period for:
Interest (net of amounts capitalized of $164 and $2,792 in 2016 and 2015, respectively)	28,655	18,609
Income taxes paid (refunded)	$ (10,520)	$ 6,706