Long-Term Debt and Interest Expense (Schedule Of Long-Term Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Revolver	$ 16,000us-gaap_LineOfCredit	$ 16,000us-gaap_LineOfCredit
Unamortized premium	1,155	1,217
Capital leases and other notes	132,880us-gaap_CapitalLeaseObligations	138,930us-gaap_CapitalLeaseObligations
Debt and Capital Lease Obligations, Total	925,035us-gaap_DebtAndCapitalLeaseObligations	931,147us-gaap_DebtAndCapitalLeaseObligations
Less current portion	46,816	48,575
Non Current Portion of Long Term Debt, Total	878,219	882,572
7.75% Senior Notes due 2019
Debt Instrument [Line Items]
Senior Notes	475,000	475,000
7.75% Senior Notes due 2022
Debt Instrument [Line Items]
Senior Notes	$ 300,000	$ 300,000

Discount or premium net of accumulated amortization.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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-Publisher SEC

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-Number 210

-Section 03

-Paragraph 16

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-Section 50

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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-Publisher FASB

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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