Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes

Schedule of components of deferred tax assets and liabilities

	December 31,
	2011		2010
Deferred tax assets:
Current:
Allowance for doubtful accounts	$	1,933	$	2,683
Unrealized loss on cash flow hedges		-		1,875
Net operating losses		-		1,893
Tax credits		541		5,437
Other accruals		55,209		78,479
Total current deferred tax assets:	$	57,683	$	90,367
Noncurrent:
Tax credits		4,605		3,558
Net operating losses		3,008		3,408
Other accruals		50,855		20,464
Total noncurrent deferred tax assets:	$	58,468	$	27,430
Total deferred tax assets	$	116,151	$	117,797
Deferred tax liabilities:
Current:
Inventories	$	59,673	$	56,490
Total current deferred tax liabilities:	$	59,673		56,490
Noncurrent:
Property and equipment		138,132		95,300
Other		9,200		866
Total noncurrent deferred tax liabilities:		147,332		96,166
Total deferred tax liabilities		207,005		152,656
Net deferred tax liabilities	$	(90,854)	$	(34,859)

Reconciliation of net deferred tax assets (liabilities)

	December 31,
	2011		2010
Deferred tax assets - current	$	57,683	$	90,367
Deferred tax liabilities - current		(59,673)		(56,490)
Deferred tax assets (liabilities) - current		(1,990)	$	33,877
Deferred tax assets - noncurrent		58,468		27,430
Deferred tax liabilities - noncurrent		(147,332)		(96,166)
Deferred tax liabilities - noncurrent		(88,864)	$	(68,736)
Net deferred tax liabilities	$	(90,854)	$	(34,859)

Schedule of components of the provision for income taxes

	Current		Deferred		Total
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
2009
Federal	$	121,919	$	44,339	$	166,258
State		17,100		6,042		23,142
	$	139,019	$	50,381	$	189,400

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

	Years ended December 31,
	2011		2010		2009
Federal income taxes at statutory rate	$	285,524	$	241,281	$	173,914
State income taxes, net of federal tax benefit		16,132		22,267		18,896
Other items, net		6,444		6,452		(3,410)
Total provision for income taxes	$	308,100	$	270,000	$	189,400

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

	Years ended December 31,
		2011		2010		2009
Balance as of January 1,	$	36,710	$	33,570	$	30,400
Addition based on tax positions related to the current year		7,308		5,138		5,900
Addition based on tax positions related to prior years		4,060		-		-
Reduction due to lapse of statute of limitations		(2,278)		(1,998)		(2,730)
Balance as of December 31,	$	45,800	$	36,710	$	33,570