XML 66 R59.htm IDEA: XBRL DOCUMENT v2.4.1.9
Long Term Debt (Schedule of Redemption Prices) (Details) (Line of Credit)
 12 Months Ended
Dec. 31, 2014
2021 Notes | Redemption period one  
Debt Instrument [Line Items]  
Redemption price, percentage 103.375%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2021 Notes | Redemption period two  
Debt Instrument [Line Items]  
Redemption price, percentage 102.25%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2021 Notes | Redemption period three  
Debt Instrument [Line Items]  
Redemption price, percentage 101.125%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2021 Notes | Redemption period four  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyTwentyOneMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes | Redemption period one  
Debt Instrument [Line Items]  
Redemption price, percentage 104.313%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes | Redemption period two  
Debt Instrument [Line Items]  
Redemption price, percentage 103.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes | Redemption period three  
Debt Instrument [Line Items]  
Redemption price, percentage 101.438%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
2019 Notes | Redemption period four  
Debt Instrument [Line Items]  
Redemption price, percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= gncma_SeniorNotesDueTwentyNineteenMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember