Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Significant Components of Deferred Tax Assets and Liabilities

purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities as of December 31 are as follows:

	2011		2010
Deferred tax assets:
Employee benefits	$	1,501	$	1,590
Inventories		5,797		3,834
Goodwill		2,323		2,805
Other		4,747		2,652
Total deferred tax assets		14,368		10,881
Deferred tax liabilities:
Depreciation		35,402		28,274
Foreign earnings		644		1,509
Total deferred tax liabilities		36,046		29,783
Net deferred tax liabilities	$	21,678	$	18,902

Significant Components of Provision for Income Taxes

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

	2011		2010		2009
Current:
Federal	$	57,429	$	34,061	$	23,712
State		4,288		3,303		2,080
Foreign		1,374		607		619
Total current		63,091		37,971		26,411
Deferred		4,223		2,662		573
	$	67,314	$	40,633	$	26,984

Reconciliation of Income Taxes Computed at the U.S. Statutary Tax Rate to the Company's Income Tax Expense

earnings. 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:

	2011						2010						2009
	Amount			Percent			Amount			Percent			Amount			Percent
U.S. statutory rate	$	69,107			35.0	%	$	41,772			35.0	%	$	27,928			35.0	%
State income taxes, net of federal tax benefit		3,103			1.6			2,148			1.8			1,351			1.7
Mining depletion		(1,162	)		(0.6	)		(1,227	)		(1.0	)		(898	)		(1.1	)
Section 199 Manufacturing Benefit, ETI Exclusion and other		(3,734	)		(1.9	)		(2,060	)		(1.8	)		(1,397	)		(1.8	)
	$	67,314			34.1	%	$	40,633			34.0	%	$	26,984			33.8	%