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Note 9 - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Insurance and claims $ 15,495 $ 16,153
Net operating loss carryovers 15,348 18,347
Tax credits 10,585 1,477
Other 4,730 6,086
Deferred fuel hedge 10,947 8,144
Valuation allowance (1,219) (1,001)
Total deferred tax assets 55,886 49,206
Deferred tax liabilities:    
Property and equipment (125,188) (103,186)
Other (4,398) (2,186)
Prepaid expenses (3,281) (2,838)
Total net deferred tax liabilities (132,867) (108,210)
Net deferred tax liability $ (76,981) $ (59,004)