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Note 9 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

(in thousands)		2017				2016				2015
Federal, current		$	(7,780	)		$	11,951			$	124
Federal, deferred			(28,055	)			(2,925	)			18,185
State, current			(1,737	)			1,811				426
State, deferred			5,430				(451	)			3,087
Actual income tax expense		$	(32,142	)		$	10,386			$	21,822

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

(in thousands)		2017				2016				2015
Computed "expected" income tax expense		$	8,154			$	9,527			$	22,368
State income taxes, net of federal income tax effect			862				953				2,237
Per diem allowances			2,145				2,205				2,329
Tax contingency accruals			(43	)			(273	)			1,599
Valuation allowance, net			(1,167	)			-				218
Tax credits			(1,084	)			(694	)			(7,151	)
Impact of Tax Cuts and Jobs Act remeasurement			(40,123	)			-				-
Excess tax benefits on share-based compensation			(457	)			-				-
Other, net			(429	)			(1,332	)			222
Actual income tax expense		$	(32,142	)		$	10,386			$	21,822

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

(in thousands)		2017				2016
Deferred tax assets:
Insurance and claims		$	8,797			$	15,147
Net operating loss carryovers			4,755				3,326
Tax credits			11,875				6,409
Other			4,414				5,113
Deferred fuel hedge			-				1,653
Valuation allowance			(63	)			(1,219	)
Total deferred tax assets			29,778				30,429
Deferred tax liabilities:
Property and equipment			(76,325	)			(98,679	)
Investment in partnership			(14,197	)			(9,730	)
Deferred fuel hedge			(99	)			-
Other			-				(1,391	)
Prepaid expenses			(2,501	)			(4,786	)
Total net deferred tax liabilities			(93,122	)			(114,586	)
Net deferred tax liability		$	(63,344	)		$	(84,157	)

Summary of Income Tax Contingencies [Table Text Block]

		2017				2016				2015
Balance as of January 1,		$	2,051			$	2,394			$	995
Increases related to prior year tax positions			19				-				1,737
Decreases related to prior year positions			(10	)			-				-
Increases related to current year tax positions			-				-				-
Decreases related to settlements with taxing authorities			-				(88	)			(182	)
Decreases related to lapsing of statute of limitations			(136	)			(255	)			(156	)
Balance as of December 31,		$	1,924			$	2,051			$	2,394

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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