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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Provision for income taxes varies from federal statutory tax rate
Expected tax expense	$ 7,450	$ 2,069
State income tax, net of federal benefit	(112)	167
Percentage depletion	(902)	(1,242)
Other, net	420	281
Total income tax provision	$ 6,856	$ 1,275

X

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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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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