Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Significant Components of Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities as of December 31 are as follows:

	2012		2011
Deferred tax assets:
Employee benefits	$	1,032	$	1,501
Inventories		7,161		5,797
Goodwill		1,842		2,323
Other		3,761		4,747
Total deferred tax assets		13,796		14,368
Deferred tax liabilities:
Depreciation		45,056		35,402
Foreign earnings		2,665		644
Total deferred tax liabilities		47,721		36,046
Net deferred tax liabilities	$	33,925	$	21,678

Significant Components of Provision for Income Taxes

Significant components of the provision for income taxes for the years ended December 31 are as follows:

	2012		2011		2010
Current:
Federal	$	37,596	$	57,429	$	34,061
State		2,268		4,288		3,303
Foreign		1,581		1,374		607
Total current		41,445		63,091		37,971
Deferred		11,212		4,223		2,662
	$	52,657	$	67,314	$	40,633

Reconciliation of Income Taxes Computed at U.S. Statutary Tax Rate to Income Tax Expense

The reconciliation of income taxes computed at the U.S. statutory tax rate to the Company’s income tax expense for the years ended December 31 is as follows:

	2012						2011						2010
	Amount			Percent			Amount			Percent			Amount			Percent
U.S. statutory rate	$	55,507			35.0	%	$	69,107			35.0	%	$	41,772			35.0	%
State income taxes, net of federal tax benefit		2,199			1.4			3,103			1.6			2,148			1.8
Mining depletion		(2,606	)		(1.6	)		(1,162	)		(0.6	)		(1,227	)		(1.0	)
Section 199 Manufacturing Benefit and other		(2,443	)		(1.6	)		(3,734	)		(1.9	)		(2,060	)		(1.8	)
	$	52,657			33.2	%	$	67,314			34.1	%	$	40,633			34.0	%