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Consolidated Statements Of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]      
Net income $ 132,893us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 115,478us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 153,314us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Pension settlement costs, net of tax (see Notes 13 and 16)   27,381us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax  
Other comprehensive income (loss), net of tax (see Note 13) (143,798)us-gaap_OtherComprehensiveIncomeLossNetOfTax 195,665us-gaap_OtherComprehensiveIncomeLossNetOfTax (96,613)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) (10,905)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 338,524us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 56,701us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Income attributable to the noncontrolling interest in a partnership   2,643us-gaap_NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable 16,678us-gaap_NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable
Comprehensive income (loss) attributable to the common shareholders of Frontier $ (10,905)us-gaap_ComprehensiveIncomeNetOfTax $ 335,881us-gaap_ComprehensiveIncomeNetOfTax $ 40,023us-gaap_ComprehensiveIncomeNetOfTax