Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Components Of Income (Loss) Before Income Taxes

The components of income (loss) before income taxes are as follows:

	Year Ended December 31,
	2013			2012			2011
Domestic	$	944,378		$	586,631		$	404,422
Foreign	(2,206		)	(1,462		)	(2,990		)
	$	942,172		$	585,169		$	401,432

Schedule Of The Provision For (Benefit From) Income Taxes

The Company's provision for (benefit from) income taxes consists of the following:

	Year Ended December 31,
	2013			2012			2011
Current
Federal	$	215,903		$	190,917		$	120,018
State	22,249			15,327			8,729
Foreign	(137		)	(837		)	(395		)
	238,015			205,407			128,352
Deferred
Federal	94,471			(5,398		)	6,732
State	(556		)	(519		)	7,682
Foreign	(183		)	124			(300		)
	93,732			(5,793		)	14,114
Total provision	$	331,747		$	199,614		$	142,466

Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense

A reconciliation of taxes computed at the statutory rate to the Company's income tax expense is as follows:

	Year Ended December 31,
	2013			2012			2011
Provision for federal income tax, at statutory rate	$	329,760		$	204,809		$	140,501
State income tax provision, net of federal income tax effect	14,364			9,625			10,745
Foreign tax	(253		)	(713		)	(695		)
Foreign losses	772			512			1,047
Manufacturing deduction	(16,275		)	(14,560		)	(9,905		)
Contingent tax liability	(404		)	—			(20		)
Other, net	3,783			(59		)	793
	$	331,747		$	199,614		$	142,466

Schedule Of Deferred Tax Assets And Liabilities

The tax effects of the principal temporary differences between financial reporting and income tax reporting at December 31 are as follows:

	2013			2012
Net operating loss carryforward	$	11,324		$	11,922
Credit carryforward	708			782
Accruals	32,352			32,486
Allowance for doubtful accounts	2,068			1,540
Inventories	15,440			7,831
Other	6,666			4,704
Deferred taxes assets—total	68,558			59,265
Property, plant and equipment	(434,561		)	(340,237		)
Turnaround costs	(26,002		)	(10,858		)
Other	(478		)	(228		)
Deferred tax liabilities—total	(461,041		)	(351,323		)
Valuation allowance	(11,324		)	(11,927		)
Total net deferred tax liabilities	$	(403,807	)	$	(303,985	)
Balance sheet classifications
Current deferred tax asset	$	34,169		$	22,305
Noncurrent deferred tax liability	(437,976		)	(326,290		)
Total net deferred tax liabilities	$	(403,807	)	$	(303,985	)

Schedule Of Changes In Gross Unrecognized Tax Benefits

The gross unrecognized tax benefits at December 31 are as follows:

	2013			2012		2011
Beginning balance	$	3,122		$	3,122	$	3,141
Reductions due to statutes of limitations expiring	(621		)	—		(19		)
Ending balance	$	2,501		$	3,122	$	3,122