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Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

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

		Year Ended December 31,
		2014				2013				2012
Current provision-
Federal		$	21,826			$	7,755			$	8,647
State			3,531				2,008				1,917
			25,357				9,763				10,564
Deferred provision-
Federal			23,243				20,470				25,752
State			1,986				1,611				2,412
			25,229				22,081				28,164
Provision (benefit) for income taxes		$	50,586			$	31,844			$	38,728

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

		Year Ended December 31,
		2014				2013				2012
Income taxes at the federal statutory rate		$	45,691			$	28,371			$	35,414
State income taxes, net of federal benefit			3,398				2,259				2,753
Tax effect of permanent differences			1,069				802				766
Other, net			428				412				(205	)
Provision for income taxes		$	50,586			$	31,844			$	38,728

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

		Year Ended December 31,
		2014				2013				2012
Income tax expense (benefit) related to components of other comprehensive income:
Change in fair value of cash flow swaps		$	308			$	338			$	133
Change in fair value of available-for-sale securities			166			–					(9	)
Total		$	474			$	338			$	124
Paid in capital – stock based compensation		$	(5,207	)		$	(2,566	)		$	(1,668	)

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

		December 31,
		2014				2013
Current:
Deferred tax assets:
Inventory		$	6,786			$	4,673
Accounts receivable			304				304
Capital lease obligations			4,217				3,821
Stock options			1,764				1,474
Accrued liabilities			3,935				4,531
State net operating loss carry forward			1,436				1,071
State tax credit			354				403
			18,796				16,277
Valuation allowance			(409	)		–
Current deferred tax asset		$	18,387			$	16,277
Non-Current:
Deferred tax assets:
Capital lease obligations		$	16,965			$	13,002
Stock options			7,056				5,894
Other			1,839				1,821
			25,860				20,717
Deferred tax liabilities:
Difference between book and tax basis-
Depreciation and amortization			(201,495	)			(168,539	)
Net non-current tax liability		$	(175,635	)		$	(147,822	)

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

		2014				2013				2012
Unrecognized tax benefits at beginning of period		$	1,545			$	1,409			$	1,337
Gross increases – tax positions in current year			815				466				358
Gross increases – tax positions in a prior year			−				−				267
Reductions due to lapse of statute of limitations			(273	)			(330	)			(553	)
Unrecognized tax benefits at end of period		$	2,087			$	1,545			$	1,409

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Disclosure of Income Taxes Related to Other Comprehensive Income.

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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