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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income (loss) $ 10,227us-gaap_NetIncomeLoss $ (1,374)us-gaap_NetIncomeLoss
Other comprehensive income (loss):    
Unrealized loss on effective portion of fuel hedges, net of tax of $1,063 and $521 in 2015 and 2014, respectively (1,712)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (846)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of fuel hedge loss (gain) into statement of operations, net of tax of $1,304 and $105 in 2015 and 2014, respectively 2,100us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet (168)us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet
Total other comprehensive income (loss) 388us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (1,014)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) $ 10,615us-gaap_ComprehensiveIncomeNetOfTax $ (2,388)us-gaap_ComprehensiveIncomeNetOfTax