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Income Taxes (Reconciliation Of Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Income tax expense (benefit) computed by applying the statutory rate	$ 13,791	$ 111,651	$ 83,027
State income tax, net of federal benefit	1,084	8,941	6,030
Statutory depletion and other	1,351	2,543	1,680
Total income taxes	$ 16,226	$ 123,135	$ 90,737

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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