Derivative Financial Instruments (Schedule Of Derivatives, Location In Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	$ 29,147us-gaap_DerivativeLiabilitiesCurrent	$ 31,069us-gaap_DerivativeLiabilitiesCurrent
Derivative Liabilities, Noncurrent	25,847us-gaap_DerivativeLiabilitiesNoncurrent	34,509us-gaap_DerivativeLiabilitiesNoncurrent
Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Total	54,994	65,578
Interest Rate Swap Contracts [Member] \| Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Total	54,994	65,578
Interest Rate Swap Contracts [Member] \| Derivatives Designated As Hedging Instruments [Member] \| Current Portion Of Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	29,147	31,069
Interest Rate Swap Contracts [Member] \| Derivatives Designated As Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Noncurrent	$ 25,847	$ 34,509

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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