CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 81,001	$ 95,235	$ 73,380
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	221,525	157,429	105,891
Amortization of deferred financing costs, discount and debt premium	18,267	8,175	6,289
Deferred revenue	(7,140)
Equity in loss of unconsolidated affiliates	2,441	213	367
Loss on early retirement of debt	7,512	162	38,430
Lease amortization	3,096	675
Unrealized (gain) loss on restricted investment	(8,765)	2,587
Stock compensation expense	19,719	13,084	6,322
Loss (gain) on sale of businesses and disposal of property and equipment	(49,575)	835	319
Impairment charges	958	13,602	38,016
(Benefit) provision for deferred income taxes	(1,649)	33,865	(112,561)
Other	1,962	1,483	567
Change in operating assets and liabilities:
Accounts receivable	4,586	6,104	(19,110)
Prepaid expenses and other assets	9,531	56	(423)
Income taxes (receivable) payable	(21,847)	6,945	(470)
Accounts payable and accrued other liabilities	30,904	(17,170)	(7,131)
Net cash provided by operating activities	312,526	323,280	129,886
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment, net	(170,766)	(147,415)	(83,161)
Purchase of restricted investments		(8,008)
Proceeds from sale of businesses, property and equipment, net of cash sold	536,133	1,002	135
Proceeds from sale of investments	4,944
Net cash used in business combinations		(1,113,227)	(1,313,051)
Investments in and loans to unconsolidated affiliates	(771)	(581)	(604)
Net cash provided by (used in) investing activities	369,540	(1,268,229)	(1,396,681)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt		846,000	2,325,000
Borrowings under Revolving Credit Facility	33,000	315,358	207,953
Payments under long-term debt			(911,875)
Payments under Revolving Credit Facility	(278,000)	(70,358)	(236,953)
Payments on Term Loan	(458,000)
Debt premium proceeds			27,500
Debt issuance costs	(456)	(25,758)	(51,526)
Taxes paid related to net share settlement of equity awards	(8,247)	(11,708)	(11,365)
Proceeds from exercise of stock options	0	154	2,900
Purchase of treasury stock		(9,131)
Payments on other long-term payables	(476)	(666)	(533)
Net cash (used in) provided by financing activities	(712,179)	1,043,891	1,351,101
(Decrease) increase in cash, cash equivalents and restricted cash	(30,113)	98,942	84,306
Cash, cash equivalents and restricted cash, beginning of period	246,691	147,749	63,443
Cash, cash equivalents and restricted cash, end of period	216,578	246,691	147,749
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH TO AMOUNTS REPORTED WITHIN THE CONSOLIDATED BALANCE SHEETS:
Cash and cash equivalents	206,317	230,752	134,596
Restricted cash	3,507	8,884	3,267
Restricted cash included in other noncurrent assets	$ 6,754	$ 7,055	$ 9,886
Restricted Cash,Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Cash, cash equivalents and restricted cash, end of period	$ 216,578	$ 246,691	$ 147,749
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	277,250	166,007	84,604
Income taxes (refunded) paid	51,131	(4,134)	246
NON-CASH FINANCING ACTIVITIES:
Payables for capital expenditures	$ 10,676	$ 11,694	$ 9,079