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Long-Term Debt (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Oct. 02, 2012
Jun. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
property
Dec. 31, 2012
Apr. 24, 2013
May 17, 2012
Aug. 15, 2012
Apr. 10, 2013
Debt Instrument [Line Items]                  
Remaining outstanding principal     $ 9,780,736,000us-gaap_DebtInstrumentCarryingAmount $ 8,129,546,000us-gaap_DebtInstrumentCarryingAmount          
Proceeds from debt, net of issuance costs     1,519,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts            
Amount of consideration for purchase of notes 155,000,000ftr_AmountOfConsiderationForPurchaseOfNotes                
Loss on early extinguishment of debt (19,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt 160,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt   (159,780,000)us-gaap_GainsLossesOnExtinguishmentOfDebt (90,363,000)us-gaap_GainsLossesOnExtinguishmentOfDebt        
Line of credit facility, current borrowings     46,845,000us-gaap_LineOfCredit            
Number of properties contributed       4ftr_DefinedBenefitPlanNumberOfPropertiesContributed          
Lease term of contributed property       15 years          
Sale and leaseback term, minimum (in years)     12 years            
Sale and leaseback term, maximum (in years)     23 years            
Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Aggregate principal amount agreed to be purchased                 471,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
Amount of consideration for purchase of notes                 532,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
Loss on early extinguishment of debt   (55,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
      (105,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
     
Loss on early extinguishment of debt, net of tax   34,000,000ftr_GainsLossesOnExtinguishmentOfDebtNetOfTax
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
      65,000,000ftr_GainsLossesOnExtinguishmentOfDebtNetOfTax
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
     
Loss on early extinguishment of debt, net of tax (in dollars per share)   $ 0.04ftr_GainsLossesOnExtinguishmentOfDebtNetOfTaxPerShare
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
      $ 0.06ftr_GainsLossesOnExtinguishmentOfDebtNetOfTaxPerShare
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
     
Senior Note Due 1/15/2013 [Member]                  
Debt Instrument [Line Items]                  
Loss on repurchase of debt         (2,000,000)us-gaap_GainLossOnRepurchaseOfDebtInstrument
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNotesOneMember
       
Repurchase of senior notes         78,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNotesOneMember
       
Senior Note Due 5/1/2014 [Member]                  
Debt Instrument [Line Items]                  
Interest Rate             8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwoMember
   
Debt instrument, maturity date       May 01, 2014          
Aggregate principal amount agreed to be purchased             400,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwoMember
   
Amount of consideration for purchase of notes             446,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwoMember
   
Senior Note Due 3/15/2015 [Member]                  
Debt Instrument [Line Items]                  
Interest Rate                 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteThreeMember
Debt Instrument, Issuance Date       Apr. 24, 2013          
Debt instrument, maturity date       Mar. 15, 2015          
Aggregate principal amount agreed to be purchased           1,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteThreeMember
    194,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteThreeMember
Amount of consideration for purchase of notes           1,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteThreeMember
    216,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteThreeMember
Senior Note Due 4/15/2015 [Member]                  
Debt Instrument [Line Items]                  
Interest Rate                 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
Debt Instrument, Issuance Date     Oct. 01, 2012            
Debt instrument, maturity date       Apr. 15, 2015 Apr. 01, 2015        
Aggregate principal amount agreed to be purchased 76,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
        1,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
50,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
  277,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
Amount of consideration for purchase of notes           1,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
54,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
  316,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
Loss on early extinguishment of debt         (69,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFourMember
       
Senior Note Due 10/14/2016 [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     575,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
           
Debt instrument, maturity date     Oct. 14, 2016 [1]            
Repayment of the outstanding principal balance, quarterly installments amount     14,000,000us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
           
Initial pricing for LIBOR based borrowings (in hundredths)     2.875%ftr_LineOfCreditFacilityInterestRateMarginBaseRateBorrowingsInitial
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
           
Senior Note Due 4/15/2017 [Member]                  
Debt Instrument [Line Items]                  
Interest Rate       8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteSixMember
         
Debt instrument, maturity date       Apr. 15, 2017          
Aggregate principal amount agreed to be purchased 59,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteSixMember
        225,000,000ftr_AggregatePrincipalAmountAgreedToBePurchased
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteSixMember
     
Amount of consideration for purchase of notes           268,000,000ftr_AmountOfConsiderationForPurchaseOfNotes
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteSixMember
     
Repurchase of senior notes   209,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteSixMember
             
Senior Note Due 10/1/2018 [Member]                  
Debt Instrument [Line Items]                  
Interest Rate   8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteSevenMember
             
Debt instrument, maturity date   Oct. 01, 2018              
Repurchase of senior notes   17,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteSevenMember
             
Senior Note Due 4/15/2020 [Member]                  
Debt Instrument [Line Items]                  
Interest Rate   8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteNineMember
             
Debt instrument, maturity date   Apr. 15, 2020              
Repurchase of senior notes   79,000,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteNineMember
             
Senior Note Due 7/1/2021 [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, face amount             500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTenMember
   
Interest Rate             9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTenMember
   
Debt Instrument, Issuance Date     May 17, 2012            
Debt instrument, maturity date       Jul. 01, 2021          
Issue price expressed as a percentage of principal amount (in hundredths)             100.00%ftr_IssuePriceExpressedAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTenMember
   
Proceeds from debt, net of issuance costs             490,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTenMember
   
Senior Note Due 1/15/2023 [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, face amount 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwelveMember
            600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwelveMember
 
Interest Rate               7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwelveMember
 
Debt Instrument, Issuance Date         Aug. 15, 2012        
Debt instrument, maturity date       Jan. 15, 2023          
Issue price expressed as a percentage of principal amount (in hundredths) 104.25%ftr_IssuePriceExpressedAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwelveMember
            100.00%ftr_IssuePriceExpressedAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwelveMember
 
Proceeds from debt, net of issuance costs 256,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwelveMember
            588,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteTwelveMember
 
Senior Notes Due 2024 [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, face amount                 750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNotesDueTwoThousandTwentyFourMember
Interest Rate                 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNotesDueTwoThousandTwentyFourMember
Debt Instrument, Issuance Date       Apr. 10, 2013          
Debt instrument, maturity date       Apr. 15, 2024          
Issue price expressed as a percentage of principal amount (in hundredths)                 100.00%ftr_IssuePriceExpressedAsPercentageOfPrincipalAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNotesDueTwoThousandTwentyFourMember
Proceeds from debt, net of issuance costs                 737,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNotesDueTwoThousandTwentyFourMember
Secured Equipment Financing [Member]                  
Debt Instrument [Line Items]                  
Interest Rate     0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SecuredEquipmentFinancingMember
           
Secured equipment financing     11,000,000us-gaap_OtherSecuredFinancings
/ us-gaap_DebtInstrumentAxis
= ftr_SecuredEquipmentFinancingMember
           
Secured equipment financing term     4 years            
Senior Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Remaining outstanding principal     9,749,566,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ftr_SeniorUnsecuredDebtMember
8,107,066,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ftr_SeniorUnsecuredDebtMember
         
Senior Unsecured Debt [Member] | Senior Note Due 10/14/2016 [Member]                  
Debt Instrument [Line Items]                  
Interest Rate     3.045%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_LongtermDebtTypeAxis
= ftr_SeniorUnsecuredDebtMember
3.045%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_LongtermDebtTypeAxis
= ftr_SeniorUnsecuredDebtMember
         
Remaining outstanding principal     402,500,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_LongtermDebtTypeAxis
= ftr_SeniorUnsecuredDebtMember
460,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_LongtermDebtTypeAxis
= ftr_SeniorUnsecuredDebtMember
         
CoBank Term Loan 2014 [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, face amount     350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ftr_CobankTermLoan2014Member
           
Repayment of the outstanding principal balance, quarterly installments amount     9,000,000us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= ftr_CobankTermLoan2014Member
           
Interest Rate Margin     3.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ftr_CobankTermLoan2014Member
           
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility maximum borrowing capacity     750,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
           
Line of credit facility, current borrowings     $ 0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
           
Interest Rate (in thousandths)     0.45%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
           
Revolving Credit Facility [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Initial pricing for LIBOR based borrowings (in hundredths)     1.50%ftr_LineOfCreditFacilityInterestRateMarginBaseRateBorrowingsInitial
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Initial pricing for LIBOR based borrowings (in hundredths)     2.50%ftr_LineOfCreditFacilityInterestRateMarginBaseRateBorrowingsInitial
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Minimum [Member] | Senior Note Due 10/14/2016 [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Minimum [Member] | Senior Note Due 10/14/2016 [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     1.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Minimum [Member] | CoBank Term Loan 2014 [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ftr_CobankTermLoan2014Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Minimum [Member] | CoBank Term Loan 2014 [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     1.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ftr_CobankTermLoan2014Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Minimum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Minimum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Maximum [Member] | Senior Note Due 10/14/2016 [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     2.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Maximum [Member] | Senior Note Due 10/14/2016 [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     3.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ftr_SeniorNoteFiveMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Maximum [Member] | CoBank Term Loan 2014 [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     2.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ftr_CobankTermLoan2014Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Maximum [Member] | CoBank Term Loan 2014 [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     3.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= ftr_CobankTermLoan2014Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Maximum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Maximum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Interest Rate Margin     2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
[1] * Represents borrowings under the 2011 CoBank Credit Agreement, as defined below.