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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)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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