Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of income tax expense (benefit)

The components of income from continuing operations before income tax provision and the income tax provision for the years ended December 31 are as follows:

	2013			2012			2011
Income from continuing operations before income tax provision
Domestic	$	54,630		$	53,167		$	106,944
Foreign	1,090			4,861			5,277
	$	55,720		$	58,028		$	112,221
Income tax provision
Current income tax provision (benefit):
Federal	$	15,392		$	(1,811	)	$	28,714
State	1,965			1,474			2,472
Foreign	1,559			1,556			1,633
Total current	18,916			1,219			32,819
Deferred income tax provision (benefit):
Federal	(5,490		)	14,107			(205		)
State	(1,141		)	668			310
Foreign	(1,015		)	(129		)	(173		)
Total deferred	(7,646		)	14,646			(68		)
	$	11,270		$	15,865		$	32,751

Effective income tax rate reconciliation

A reconciliation of the federal statutory and effective income tax rate for the years ended December 31 is as follows:

	2013			2012			2011
Income from continuing operations before income tax provision	$	55,720		$	58,028		$	112,221
Statutory taxes at 35.0%	$	19,502		$	20,310		$	39,277
State and local income taxes	136			1,568			1,925
Non-deductible expenses	1,081			1,112			1,336
Percentage depletion	(8,057		)	(4,963		)	(6,895		)
R&D and other federal credits	(1,173		)	(132		)	(206		)
Other, net	(219		)	(2,030		)	(2,686		)
Income tax provision	$	11,270		$	15,865		$	32,751
Effective income tax rate	20.2		%	27.3		%	29.2		%

Deferred tax assets and liabilities

A detailed summary of the total deferred tax assets and liabilities in the Company's Consolidated Balance Sheets resulting from differences in the book and tax basis of assets and liabilities follows:

	December 31
	2013			2012
Deferred tax assets
Tax carryforwards	$	5,029		$	6,995
Inventories	4,709			3,139
Accrued expenses and reserves	26,019			24,041
Accrued pension benefits	—			7,357
Other employee benefits	11,432			7,971
Other	7,375			7,201
Total deferred tax assets	54,564			56,704
Less: Valuation allowance	2,280			3,082
	52,284			53,622
Deferred tax liabilities
Depreciation and depletion	39,906			45,023
Partnership investment - development costs	20,215			19,852
Accrued pension benefits	1,037			—
Unremitted foreign earnings	168			101
Total deferred tax liabilities	61,326			64,976
Net deferred liability	$	(9,042	)	$	(11,354	)

Summary of tax credit carryforwards

The following table summarizes the tax carryforwards and associated carryforward periods and related valuation allowances where the Company has determined that realization is uncertain:

	December 31, 2013
	Net deferred tax asset		Valuation allowance		Carryforwards expire during:
Non-U.S. net operating loss	$	430	$	351	2020 - Indefinite
State losses	4,529		1,849		2014 - 2033
Alternative minimum tax credit	70		—		Indefinite
Total	$	5,029	$	2,200

	December 31, 2012
	Net deferred tax asset		Valuation allowance		Carryforwards expire during:
Non-U.S. net operating loss	$	367	$	366	2020 - Indefinite
State losses	4,761		2,650		2014 - 2033
Alternative minimum tax credit	1,867		—		Indefinite
Total	$	6,995	$	3,016

Unrecognized tax benefits roll forward

	2013			2012
Balance at January 1	$	2,691		$	2,965
Additions based on tax positions related to prior years	5,615			—
Additions based on tax positions related to the current year	78			264
Reductions due to settlements with taxing authorities and the lapse of the applicable statute of limitations	(536		)	(538		)
Balance at December 31	$	7,848		$	2,691