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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income | $ 17,808 us-gaap_NetIncomeLoss | $ 5,244 us-gaap_NetIncomeLoss | $ 6,065 us-gaap_NetIncomeLoss
Other comprehensive (loss) income: |  |  |
Unrealized (loss) gain on effective portion of fuel hedges, net of tax of $9,892, $567, and $2,100 in 2014, 2013 and 2012 , respectively | (15,869)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 909 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 3,369 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of fuel hedge losses (gains) into statement of operations, net of tax of $1,206, $247, and $1,932 in 2014, 2013, and 2012, respectively | 1,935 us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet | (396)us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet | (3,099)us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet
Total other comprehensive (loss) income | (13,934)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 513 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 270 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income | $ 3,874 us-gaap_ComprehensiveIncomeNetOfTax | $ 5,757 us-gaap_ComprehensiveIncomeNetOfTax | $ 6,335 us-gaap_ComprehensiveIncomeNetOfTax

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