Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 76,974	$ 95,522
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	76,649	73,057
Asset impairments	1,580	259
Amortization of debt issuance costs and other non-cash interest	1,705	1,566
Expenses associated with debt refinancing transactions	1,016
Deferred income taxes	1,283	2,198
Non-cash revenue and other income	(8,634)	(10,740)
Non-cash equity compensation	7,466	8,145
Other expenses and non-cash items	3,219	1,964
Changes in assets and liabilities, net:
Accounts receivable, prepaid expenses and other assets	23,182	27,952
Accounts payable, accrued expenses and other liabilities	2,045	(15,907)
Income taxes payable	(2,834)	(1,233)
Net cash provided by operating activities	183,651	182,783
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for facility development and expansions	(13,164)	(13,862)
Expenditures for other capital improvements	(30,966)	(20,929)
Acquisitions, net of cash acquired	(50,459)	(14,077)
Proceeds from sale of assets	149	100
(Increase) decrease in other assets	(1,653)	4,893
Payments received on direct financing lease and notes receivable		684
Net cash used in investing activities	(96,093)	(43,191)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of debt and borrowings from credit facility	558,521	120,500
Scheduled principal repayments	(2,981)	(5,000)
Other principal repayments of debt	(506,500)	(144,500)
Payment of debt issuance and other refinancing and related costs	(5,337)	(65)
Payment of lease obligations	(803)	(1,149)
Contingent consideration for acquisition of businesses	(1,500)
Dividends paid	(102,066)	(101,064)
Purchase and retirement of common stock	(2,544)	(5,818)
Proceeds from exercise of stock options		6,377
Net cash used in financing activities	(63,210)	(130,719)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	24,348	8,873
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	52,183	37,711
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	76,531	46,584
Cash paid during the period for:
Interest (net of amounts capitalized of $69 and $0 in 2018 and 2017, respectively)	33,758	28,786
Income taxes paid	$ 7,591	$ 2,295