Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

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

Year Ended December 31,	2015		2014		2013
Current:
Federal	$	58,408	$	56,342	$	46,727
State		14,572		7,944		5,539
		72,980		64,286		52,266
Deferred:
Federal		6,046		10,433		9,010
State		679		236		(702	)
		6,725		10,669		8,308
Total	$	79,705	$	74,955	$	60,574

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

Year Ended December 31,	2015			2014			2013
Federal tax provision at statutory rate	$	91,947		$	73,673		$	58,026
State taxes, net of federal income tax benefit		9,357			6,526			3,141
Equity investment basis difference		11,048			1,422			—
Non-deductible items		882			1,766			1,010
Permanent differences related to the employee stock purchase program		156			68			55
Net change in valuation allowance		(3,303	)		(4,121	)		(554	)
General business credits		(29,093	)		(4,002	)		(440	)
Other		(1,289	)		(377	)		(664	)
Income tax provision	$	79,705		$	74,955		$	60,574

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

December 31,	2015			2014
Deferred tax assets:
Deferred revenue and cancellation reserves	$	39,323		$	31,539
Allowances and accruals, including state tax carryforward amounts		43,185			29,198
Interest on derivatives		206			678
Goodwill		2,581			2,668
Capital loss carryforward		10,414			10,711
Valuation allowance		(5,360	)		(8,663	)
Total deferred tax assets		90,349			66,131
Deferred tax liabilities:
Inventories		(21,313	)		(19,356	)
Goodwill		(31,258	)		(21,320	)
Property and equipment, principally due to differences in depreciation		(84,355	)		(67,271	)
Prepaid expenses and other		(6,552	)		(3,582	)
Total deferred tax liabilities		(143,478	)		(111,529	)
Total	$	(53,129	)	$	(45,398	)

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

Balance, December 31, 2013	$	—
Acquired with acquisition		1,495
Balance, December 31, 2014		1,495
Decrease related to tax positions taken - prior year		(464	)
Balance, December 31, 2015	$	1,031

Summary of Income Tax Contingencies [Table Text Block]

Federal	2012	-	2015
18 states	2011	-	2015