CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 37,055	$ 37,704	$ 94,220	$ 95,355
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	52,592	35,760	166,882	99,204
Amortization of deferred financing costs, discount and debt premium			13,861	3,753
Deferred revenue			(4,966)
Unrealized gain on restricted investment	(3,318)		(460)
Loss on early retirement of debt	1,204		1,204	162
Lease amortization			2,367	1,285
Stock compensation expense	4,300	2,500	15,723	9,645
(Gain) loss on sale or disposal of property and equipment	284	110	(21,668)	393
Impairment charges		3,787	958	13,602
Provision for deferred income taxes			26,080	28,345
Loss from unconsolidated affiliates	1,515	63	2,132	116
Other			1,204	1,119
Change in operating assets and liabilities:
Accounts receivable			10,147	(441)
Prepaid expenses and other assets			5,489	1,602
Income taxes payable			(30,318)	4,398
Accounts payable and accrued other liabilities			(22,772)	4,910
Net cash provided by operating activities			260,083	263,448
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment, net			(135,016)	(89,082)
Sale of restricted investments			4,962
Proceeds from sale of businesses, property and equipment, net of cash sold			169,361	920
Net cash used in business combinations				(306,274)
Investment in and loans to unconsolidated affiliates			(815)	(698)
Net cash provided by (used in) investing activities			38,492	(395,134)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on Term Loan			(70,000)
Net (payments) borrowings under Revolving Credit Facility			(245,000)	180,000
Debt issuance costs			(458)	(5,401)
Taxes paid related to net share settlement of equity awards			(7,574)	(10,601)
Proceeds from exercise of stock options				154
Payments on other long-term payables			(372)	(501)
Net cash (used in) provided by financing activities			(323,404)	763,651
(Decrease) Increase in cash, cash equivalents and restricted cash			(24,829)	631,965
Cash, cash equivalents and restricted cash, beginning of period			246,691	147,749
Cash, cash equivalents and restricted cash, end of period	221,862	779,714	221,862	779,714
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH TO AMOUNTS REPORTED WITHIN THE CONDENSED CONSOLIDATED BALANCE SHEETS:
Cash and cash equivalents	208,831	164,086	208,831	164,086
Restricted cash	6,437	1,622	6,437	1,622
Restricted and escrow cash included in other noncurrent assets	6,594	614,006	6,594	614,006
Cash, cash equivalents and restricted cash, end of period	$ 221,862	$ 779,714	221,862	779,714
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid			213,719	86,964
Income taxes paid, net			43,053	3,953
NON-CASH FINANCING ACTIVITIES:
Payables for capital expenditures			$ 11,292	11,190
6% Senior Notes due 2026
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of 6% Senior Notes due 2026				$ 600,000