Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows From Operating Activities:
Net (loss) income	$ (626)	$ 60,161
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	156,677	138,469
Amortization of debt issuance costs and discounts	3,999	5,170
Loss on early extinguishment of debt and write-off of discounts and debt issuance costs		20,348
Loss on sale or disposal of assets	6,823	4,334
Loss on derivatives	1	288
Deferred income tax provision	27,405	34,462
Equity-based compensation	34,596	4,800
Changes in assets and liabilities:
Accounts receivable	(14,447)	(15,097)
Inventories	(2,218)	556
Prepaid expenses and other current assets	5,086	3,195
Accounts payable	(2,762)	(1,771)
Accrued salaries, wages and benefits	4,587	(3,468)
Deferred revenue	21,736	22,608
Other accrued expenses	7,771	6,510
Other assets and liabilities	10,243	(645)
Net cash provided by operating activities	258,871	279,920
Cash Flows From Investing Activities:
Capital expenditures	(135,496)	(117,129)
Change in restricted cash	(624)	(379)
Net cash used in investing activities	(136,120)	(117,508)
Cash Flows From Financing Activities:
Proceeds from the issuance of debt		280,000
Repayment of long-term debt	(12,637)	(271,938)
Proceeds from draw on revolving credit facility	85,000	45,000
Repayment of revolving credit facility	(100,000)	(45,000)
Dividends paid to stockholders	(56,756)	(54,370)
Payment of tax withholdings on equity-based compensation through shares withheld	(1,604)	(838)
Exercise of stock options	82
Debt issuance costs		(4,571)
Redemption premium payment		(14,300)
Purchase of treasury stock		(20,650)
Net cash used in financing activities	(85,915)	(86,667)
Change in Cash and Cash Equivalents	36,836	75,745
Cash and Cash Equivalents—Beginning of period	18,971	43,906
Cash and Cash Equivalents—End of period	55,807	119,651
Supplemental Disclosures of Noncash Investing and Financing Activities
Capital expenditures in accounts payable	10,872	18,404
Dividends declared, but unpaid	$ 9,467	$ 18,396