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 provision-
Federal	$	15,236	$	7,513	$	21,826
State		2,300		2,592		3,531
		17,536		10,105		25,357
Deferred provision-
Federal		8,260		29,561		23,243
State		71		2,084		1,986
		8,331		31,645		25,229
Provision (benefit) for income taxes	$	25,867	$	41,750	$	50,586

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

	Year Ended December 31,
	2016		2015		2014
Income taxes at the federal statutory rate	$	23,255	$	37,733	$	45,691
State income taxes, net of federal benefit		1,552		3,053		3,398
Tax effect of permanent differences		887		959		1,069
Other, net		173		5		428
Provision for income taxes	$	25,867	$	41,750	$	50,586

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

	Year Ended December 31,
	2016		2015		2014
Income tax expense (benefit) related to components of other comprehensive income:
Change in fair value of cash flow swaps	$	−	$	92	$	308
Change in fair value of available-for-sale securities		13		7		166
Total	$	13	$	99	$	474
Paid in capital – stock based compensation	$	294	$	337	$	(5,207	)

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

	December 31,
	2016			2015
Deferred income tax (assets) liabilities:
Inventory	$	(5,074	)	$	(6,039	)
Accounts receivable		(203	)		(187	)
Capital lease obligations		(31,263	)		(30,993	)
Stock options		(11,655	)		(10,719	)
Accrued liabilities		(3,610	)		(3,685	)
State net operating loss carry forward		(1,921	)		(1,570	)
State tax credit		(380	)		(382	)
Other		(5,170	)		(2,606	)
Difference between book and tax basis- Depreciation and amortization		256,352			244,716
		197,076			188,535
Valuation allowance		255			452
Net deferred income tax liability	$	197,331		$	188,987

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

	2016			2015			2014
Unrecognized tax benefits at beginning of period	$	2,332		$	2,087		$	1,545
Gross increases – tax positions in current year		429			692			815
Gross increases – tax positions in a prior year					−			−
Reductions due to lapse of statute of limitations		(360	)		(447	)		(273	)
Unrecognized tax benefits at end of period	$	2,401		$	2,332		$	2,087