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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 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)