Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Allowance for losses and nondeductible accruals	$ 55,231	$ 77,285
Net operating loss carryforward	54,901	61,055
Alternative minimum tax and research and development tax credit carryforward	25,991	17,258
Deferred tax assets, total	136,123us-gaap_DeferredTaxAssetsNet	155,598us-gaap_DeferredTaxAssetsNet
Depreciation, depletion, amortization, and impairment	(1,000,811)	(943,411)
Net deferred tax liability	(864,688)us-gaap_DeferredTaxLiabilities	(787,813)us-gaap_DeferredTaxLiabilities
Current deferred tax asset	11,527us-gaap_DeferredTaxAssetsNetCurrent	13,585us-gaap_DeferredTaxAssetsNetCurrent
Non-current-deferred tax liability	$ (876,215)	$ (801,398)

Deferred tax assets tax deferred expense allowance for losses and nondeductible accruals

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Deferred tax liability depreciation, depletion, amortization and impairment

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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