Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes

Schedule of current and deferred federal and state income tax expense (benefit)

The current and deferred federal and state income tax expense (benefit) for the years ended December 31 is as follows (in thousands):

	2012		2011		2010
Current income tax expense	$	11,334	$	128,209	$	39,554
Deferred income tax expense		50,451		30,418		44,306
Total income tax expense	$	61,785	$	158,627	$	83,860

Schedule of reconciliation of statutory tax rates to actual effective tax rates

	2012			2011			2010
Statutory federal tax rate		35.0	%		35.0	%		35.0	%
State income taxes, net of federal benefit		3.4			3.5			3.2
Audit settlements		(9.6	)		—			—
Other permanent differences		1.5			(1.1	)		1.1
Effective tax rate		30.3	%		37.4	%		39.3	%

Schedule of components of deferred tax assets and liabilities

Significant components of the company's deferred tax assets and liabilities at December 31 are as follows (in thousands):

	2012			2011
Deferred tax assets
Accrued expenses and allowances	$	22,714		$	31,670
Inventories		9,643			9,287
Other		10,680			3,150
Total deferred tax assets		43,037			44,107
Deferred tax liabilities
Property, plant and equipment		(465,273	)		(428,699	)
Intangible assets		(79,998	)		(68,500	)
Other		(11,621	)		(11,482	)
Total deferred tax liabilities		(556,892	)		(508,681	)
Net deferred tax liability	$	(513,855	)	$	(464,574	)

Schedule of reconciliation of beginning and ending amount of unrecognized tax benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

	2012			2011			2010
Balance at January 1	$	64,555		$	49,396		$	49,587
Increases related to current year tax positions		—			2,046			300
Increases related to prior year tax positions		741			13,785			1,361
Decreases related to prior year tax positions		(40,741	)		(196	)		(496	)
Lapses in statutes of limitations		—			—			(1,128	)
Settlements with taxing authorities		(2,310	)		(476	)		(228	)
Balance at December 31	$	22,245		$	64,555		$	49,396