Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes

Schedule of income tax expense

	2012		2011		2010
Current income tax expense	$	3,547	$	4,398	$	3,945
Deferred income tax expense		2,131		3,560		3,073
Income tax expense	$	5,678	$	7,958	$	7,018

Schedule of reconciliation of income taxes computed at the federal statutory rate to income tax expense

	2012						2011						2010
	Amount			Percent of pretax income			Amount			Percent of pretax income			Amount			Percent of pretax income
Income taxes computed at the federal statutory rate	$	7,735			35.0	%	$	10,550			35.0	%	$	8,770			35.0	%
(Reduction) increase in taxes resulting from:
Statutory depletion in excess of cost depletion		(2,048	)		(9.3	)		(2,366	)		(7.9	)		(1,584	)		(6.3	)
Manufacturing deduction		(335	)		(1.5	)		(308	)		(1.0	)		(397	)		(1.6	)
State income taxes, net of federal income tax benefit		331			1.5			24			0.1			155			0.6
Other		(5	)		0.0			58			0.2			74			0.3
Income tax expense	$	5,678			25.7	%	$	7,958			26.4	%	$	7,018			28.0	%

Summary of the Company's deferred tax liabilities and assets

	December 31, 2012		December 31, 2011
Deferred tax liabilities
Lime and limestone property, plant and equipment	$	19,306	$	17,625
Natural gas interests drilling costs and equipment		3,952		4,247
Other		344		316
		23,602		22,188
Deferred tax assets
Alternative minimum tax credit carry forwards		6,489		7,364
Minimum pension liability		412		448
Fair value liability of interest rate hedges		956		1,268
Other		769		611
		8,626		9,691
Net deferred tax liabilities	$	14,976	$	12,497

        Current income taxes are classified on the Company's Consolidated Balance Sheets as follows:

Accrued expenses	$	307	$	—
Prepaid expenses and other current assets	$	—	$	241

        Deferred income taxes are classified on the Company's Consolidated Balance Sheets as follows:

Prepaid expenses and other current assets	$	678	$	515
Deferred tax liabilities, net	$	15,654	$	13,012