Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2012		2011		2010
Current provision-
Federal	$	8,647	$	3,081	$	3,850
State		1,917		3,203		1,965
		10,564		6,284		5,815
Deferred provision-
Federal		25,752		27,495		9,962
State		2,412		1,185		253
		28,164		28,680		10,215
Provision (benefit) for income taxes	$	38,728	$	34,964	$	16,030

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2012			2011			2010
Income taxes at the federal statutory rate	$	35,414		$	31,562		$	16,559
State income taxes, net of federal benefit		2,753			2,795			1,418
Tax effect of permanent differences		766			621			542
Alternative fuel tax credits		–			–			(2,461	)
Other, net		(205	)		(14	)		(28	)
Provision for income taxes	$	38,728		$	34,964		$	16,030

Schedule of Income Tax Expense (Benefits) by Continuing and Discontinued Operations [Table Text Block]

	2012		2011		2010
Income tax provision on continuing operations	$	38,728	$	34,964	$	11,737
Income tax provision from discontinued operations		–		–		4,293
Provision for income taxes	$	38,728	$	34,964	$	16,030

Schedule of Income Taxes Related to Other Comprehensive Income [Table Text Block]

	2012			2011			2010
Income tax expense (benefit) related to components of other comprehensive income:
Change in fair value of cash flow swaps	$	133		$	(728	)	$	(142	)
Change in fair value of available-for-sale securities		(9	)		(360	)		–
Total	$	124		$	(1,088	)	$	(142	)
Paid in capital – stock based compensation	$	(1,668	)	$	(1,993	)	$	(885	)

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2012			2011
Current:
Deferred tax assets:
Inventory	$	4,424		$	2,944
Accounts receivable		164			178
Capital lease obligations		4,604			4,217
Stock options		1,409			1,145
Accrued liabilities		2,337			2,453
State net operating loss carry forward		905			393
State tax credit		477			527
Other		310			429
Current deferred tax asset	$	14,630		$	12,286
Non-Current:
Deferred tax assets:
Capital lease obligations	$	13,811		$	12,651
Stock options		5,635			4,579
Other		1,679			1,231
		21,125			18,461
Deferred tax liabilities:
Difference between book and tax basis-
Depreciation		(144,881	)		(111,584	)
Net non-current tax liability	$	(123,756	)	$	(93,123	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	2012			2011			2010
Unrecognized tax benefits at beginning of period	$	1,337		$	1,466		$	1,761
Gross increases – tax positions in current year		358			290			177
Gross increases – tax positions in a prior year		267			119			–
Reductions due to lapse of statute of limitations		(553	)		(538	)		(472	)
Unrecognized tax benefits at end of period	$	1,409		$	1,337		$	1,466