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Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

Year Ended December 31,		2016				2015				2014
Current:
Federal		$	68,088			$	58,408			$	56,342
State			13,884				14,572				7,944
			81,972				72,980				64,286
Deferred:
Federal			4,893				6,046				10,433
State			(400	)			679				236
			4,493				6,725				10,669
Total		$	86,465			$	79,705			$	74,955

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

Year Ended December 31,		2016				2015				2014
Federal tax provision at statutory rate		$	99,233			$	91,947			$	73,673
State taxes, net of federal income tax benefit			10,784				9,357				6,526
Equity investment basis difference			9,470				11,048				1,422
Non-deductible items			1,436				882				1,766
Permanent differences related to employee stock purchase program			139				156				68
Net change in valuation allowance			(5,133	)			(3,303	)			(4,121	)
General business credits			(27,950	)			(29,093	)			(4,002	)
Other			(1,514	)			(1,289	)			(377	)
Income tax provision		$	86,465			$	79,705			$	74,955

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

December 31,		2016				2015
Deferred tax assets:
Deferred revenue and cancellation reserves		$	49,332			$	39,323
Allowances and accruals, including state NOL carryforward amounts			49,074				43,185
Interest on derivatives			—				206
Credits and other			1,781				2,581
Capital loss carryforward			—				10,414
Valuation allowance			(227	)			(5,360	)
Total deferred tax assets			99,960				90,349
Deferred tax liabilities:
Inventories			(22,253	)			(21,313	)
Goodwill			(41,107	)			(31,258	)
Property and equipment, principally due to differences in depreciation			(93,943	)			(84,355	)
Prepaid expenses and other			(1,732	)			(6,552	)
Total deferred tax liabilities			(159,035	)			(143,478	)
Total		$	(59,075	)		$	(53,129	)

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

Balance, December 31, 2014		$	1,495
Decrease related to tax positions taken - prior year			(464	)
Balance, December 31, 2015			1,031
Decrease related to tax positions taken - prior year			(1,031	)
Balance, December 31, 2016		$	—

Summary of Income Tax Contingencies [Table Text Block]

Federal		2013	-	2016
19 states		2012	-	2016

X

- Definition

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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