Income Taxes (Tables)

3 Months Ended

Mar. 31, 2013

INCOME TAXES: [Abstract]

Components of Consolidated Income Taxes

	For the Three Months Ended March 31,
	2013					2012
	Amount			Percent		Amount			Percent
Statutory U.S. federal income tax rate	$	(455	)	35.0	%	$	41,502		35.0	%
Impact of excess tax depletion	1,428			(109.9	)	(26,514		)	(22.4	)
Net effect of state income taxes	(179		)	13.7		3,510			3.0
Other	(272		)	21.0		2,883			2.4
Income Tax Expense / Effective Rate	$	522		(40.2	)%	$	21,381		18.0	%