Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows From Operating Activities:
Net loss	$ (37,789)	$ (11,811)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	93,964	84,362
Amortization of debt issuance costs and discounts	4,013	4,714
Loss on early extinguishment of debt and write-off of discounts and debt issuance costs	20,348
Loss on sale or disposal of assets	3,744	1,093
Loss on derivatives	287
Deferred income tax benefit	(24,268)	(8,268)
Equity-based compensation	3,251	1,335
Changes in assets and liabilities:
Accounts receivable	(22,608)	(7,501)
Inventories	(5,615)	(8,099)
Prepaid expenses and other current assets	511	(2,354)
Accounts payable	26,780	24,697
Accrued salaries, wages and benefits	4,610	(4,970)
Deferred revenue	71,485	53,799
Other accrued expenses	3,057	4,418
Other assets and liabilities	312	2,094
Net cash provided by operating activities	142,082	133,509
Cash Flows From Investing Activities:
Capital expenditures	(83,534)	(93,847)
Change in restricted cash	(179)	(229)
Net cash used in investing activities	(83,713)	(94,076)
Cash Flows From Financing Activities:
Proceeds from the issuance of debt	280,000
Repayment of long-term debt	(267,725)	(7,025)
Proceeds from draw on revolving credit facility	45,000	40,000
Repayment of revolving credit facility	(45,000)	(40,000)
Dividends paid to stockholders	(36,262)	(35,407)
Debt issuance costs	(4,571)
Redemption premium payment	(14,300)
Purchase of treasury stock	(5,650)	(50,706)
Payment of tax withholdings on equity-based compensation through shares withheld	(836)	(130)
Net cash used in financing activities	(49,344)	(93,268)
Change in Cash and Cash Equivalents	9,025	(53,835)
Cash and Cash Equivalents-Beginning of period	43,906	116,841
Cash and Cash Equivalents-End of period	52,931	63,006
Supplemental Disclosures of Noncash Investing and Financing Activities
Capital expenditures in accounts payable	18,984	22,215
Dividends declared, but unpaid	$ 18,391	$ 18,590