Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows From Operating Activities:
Net income	$ 60,161	$ 75,365
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	138,469	128,733
Amortization of debt issuance costs and discounts	5,170	7,068
Loss on early extinguishment of debt and write-off of discounts and debt issuance costs	20,348	461
Loss on sale or disposal of assets	4,334	1,694
Loss on derivatives	288	0
Deferred income tax provision	34,462	45,356
Equity-based compensation	4,800	1,905
Changes in assets and liabilities:
Accounts receivable	(15,097)	(3,091)
Inventories	556	(557)
Prepaid expenses and other current assets	3,195	1,890
Accounts payable	(1,771)	(3,746)
Accrued salaries, wages and benefits	(3,468)	(11,595)
Deferred revenue	22,608	9,191
Other accrued expenses	6,510	14,162
Other assets and liabilities	(645)	3,103
Net cash provided by operating activities	279,920	269,939
Cash Flows From Investing Activities:
Capital expenditures	(117,129)	(122,809)
Change in restricted cash	(379)	(373)
Acquisition of intangible assets	0	(1,900)
Net cash used in investing activities	(117,508)	(125,082)
Cash Flows From Financing Activities:
Proceeds from the issuance of debt	280,000	0
Repayment of long-term debt	(271,938)	(42,025)
Proceeds from draw on revolving credit facility	45,000	40,000
Repayment of revolving credit facility	(45,000)	(40,000)
Dividends paid to stockholders	(54,370)	(53,639)
Debt issuance costs	(4,571)	0
Redemption premium payment	(14,300)	0
Purchase of treasury stock	(20,650)	(50,708)
Payment of tax withholdings on equity-based compensation through shares withheld	(838)	(134)
Net cash used in financing activities	(86,667)	(146,506)
Change in Cash and Cash Equivalents	75,745	(1,649)
Cash and Cash Equivalents-Beginning of period	43,906	116,841
Cash and Cash Equivalents-End of period	119,651	115,192
Supplemental Disclosures of Noncash Investing and Financing Activities
Capital expenditures in accounts payable	18,404	13,616
Dividends declared, but unpaid	$ 18,396	$ 18,647