Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows From Operating Activities:
Net loss	$ (43,598)us-gaap_NetIncomeLoss	$ (49,217)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	43,854us-gaap_DepreciationAndAmortization	41,276us-gaap_DepreciationAndAmortization
Amortization of debt issuance costs and discounts	2,328	2,359
Loss on sale or disposal of assets	624us-gaap_GainLossOnDispositionOfAssets1	908us-gaap_GainLossOnDispositionOfAssets1
Loss on derivatives	286
Deferred income tax benefit	(27,040)us-gaap_DeferredIncomeTaxExpenseBenefit	(32,644)us-gaap_DeferredIncomeTaxExpenseBenefit
Equity-based compensation	1,853us-gaap_ShareBasedCompensation	762us-gaap_ShareBasedCompensation
Changes in assets and liabilities:
Accounts receivable	(1,892)	3,231
Inventories	(4,743)us-gaap_IncreaseDecreaseInInventories	(5,579)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(2,213)	(3,417)
Accounts payable	9,019	10,636
Accrued salaries, wages and benefits	(3,348)	(7,532)
Deferred revenue	52,401	41,293
Other accrued expenses	10,113	10,034
Other assets and liabilities	38	901
Net cash provided by operating activities	37,682	13,011
Cash Flows From Investing Activities:
Capital expenditures	(40,673)	(46,827)
Change in restricted cash	(280)	(504)
Net cash used in investing activities	(40,953)	(47,331)
Cash Flows From Financing Activities:
Repayment of long-term debt	(3,513)us-gaap_RepaymentsOfLongTermDebt	(3,512)us-gaap_RepaymentsOfLongTermDebt
Proceeds from draw on revolving credit facility	45,000us-gaap_ProceedsFromLinesOfCredit
Repayment of revolving credit facility	(15,000)us-gaap_RepaymentsOfLinesOfCredit
Dividends paid to stockholders	(18,098)us-gaap_PaymentsOfDividendsCommonStock	(17,691)us-gaap_PaymentsOfDividendsCommonStock
Purchase of treasury stock	(5,650)
Payment of tax withholdings on equity-based compensation through shares withheld	(5)	(78)
Net cash provided by (used in) financing activities	2,734	(21,281)
Change in Cash and Cash Equivalents	(537)	(55,601)
Cash and Cash Equivalents-Beginning of period	43,906	116,841
Cash and Cash Equivalents-End of period	43,369	61,240
Supplemental Disclosures of Noncash Investing and Financing Activities
Capital expenditures in accounts payable	24,437	31,506
Dividends declared, but unpaid	$ 18,373	$ 18,015

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