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Fair Value of Financial Instruments (Changes In Fair Value Of Plan's Level 3 Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Interest in Limited Partnerships and Limited Liability Corporations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance, beginning of year $ 129,276us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
$ 101,678us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
Realized gains/(losses) 12,101us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
10,835us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
Unrealized gains/(losses) (4,800)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
18,033us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
Contributed assets   23,422ftr_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsContributed
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
Sales (33,381)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
(24,692)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
Balance, end of year 103,196us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
129,276us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= ftr_InterestInLimitedPartnershipsMember
Commingled Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance, beginning of year 33,444us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
39,814us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
Realized gains/(losses) 5,283us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
975us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
Unrealized gains/(losses) (5,079)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
2,656us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
Sales (33,648)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
(10,001)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember
Balance, end of year   $ 33,444us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_InvestmentTypeAxis
= ftr_CommingledFundsMember