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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Insurance and claims $ 15,147 $ 15,495
Net operating loss carryovers 3,326 15,348
Tax credits 6,409 10,585
Other 5,113 4,730
Deferred fuel hedge 1,653 10,947
Valuation allowance (1,219) (1,219)
Total deferred tax assets 30,429 55,886
Deferred tax liabilities:    
Property and equipment (98,679) (125,188)
Other (11,121) (4,398)
Prepaid expenses (4,786) (3,281)
Total net deferred tax liabilities (114,586) (132,867)
Net deferred tax liability $ (84,157) $ (76,981)