Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Taxes

Schedule of components of deferred tax assets and liabilities

	December 31,
	2012		2011
Deferred tax assets:
Current:
Allowance for doubtful accounts	$	1,937	$	1,933
Tax credits		1,583		541
Other accruals		55,683		55,209
Total current deferred tax assets:		59,203		57,683
Noncurrent:
Tax credits		5,333		4,605
Net operating losses		2,077		3,008
Other accruals		58,605		50,855
Total noncurrent deferred tax assets:		66,015		58,468
Total deferred tax assets	$	125,218	$	116,151
Deferred tax liabilities:
Current:
Inventories	$	78,675	$	59,673
Total current deferred tax liabilities:		78,675		59,673
Noncurrent:
Property and equipment		132,547		138,132
Other		13,012		9,200
Total noncurrent deferred tax liabilities:		145,559		147,332
Total deferred tax liabilities		224,234		207,005
Net deferred tax liabilities	$	(99,016)	$	(90,854)

Reconciliation of net deferred tax assets (liabilities)

	December 31,
	2012		2011
Deferred tax assets - current	$	59,203	$	57,683
Deferred tax liabilities - current		(78,675)		(59,673)
Deferred tax liabilities - current		(19,472)	$	(1,990)
Deferred tax assets - noncurrent		66,015		58,468
Deferred tax liabilities - noncurrent		(145,559)		(147,332)
Deferred tax liabilities - noncurrent		(79,544)	$	(88,864)
Net deferred tax liabilities	$	(99,016)	$	(90,854)

Schedule of components of the provision for income taxes

	Current		Deferred		Total
2012
Federal	$	311,631	$	10,030	$	321,661
State		35,982		(1,868)		34,114
	$	347,613	$	8,162	$	355,775
2011
Federal	$	228,443	$	55,175	$	283,618
State		25,537		(1,055)		24,482
	$	253,980	$	54,120	$	308,100
2010
Federal	$	146,259	$	88,395	$	234,654
State		24,484		10,862		35,346
	$	170,743	$	99,257	$	270,000

Reconciliation of the provision for income taxes to the amounts computed at the federal statutory rate

	Year ended December 31,
	2012		2011		2010
Federal income taxes at statutory rate	$	329,532	$	285,524	$	241,281
State income taxes, net of federal tax benefit		22,426		16,132		22,267
Other items, net		3,817		6,444		6,452
Total provision for income taxes	$	355,775	$	308,100	$	270,000

Summary of changes in gross amount of unrecognized tax benefits, excluding interest and penalties

	Year ended December 31,
		2012		2011		2010
Balance as of January 1,	$	45,800	$	36,710	$	33,570
Additions based on tax positions related to the current year		8,100		7,308		5,138
Additions based on tax positions related to prior years		1,301		4,060		-
Payments related to settled items		(451)		-		-
Reductions due to lapse of statute of limitations		(3,746)		(2,278)		(1,998)
Balance as of December 31,	$	51,004	$	45,800	$	36,710