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Long Term Debt (Schedule of Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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| Debt Instrument [Line Items] |
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| Long-term debt, gross |
$ 1,038,796us-gaap_DebtInstrumentCarryingAmount
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$ 1,050,425us-gaap_DebtInstrumentCarryingAmount
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| Less unamortized discount paid on the 2019 Notes |
2,118us-gaap_DebtInstrumentUnamortizedDiscount
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| Less current portion of long-term debt |
622us-gaap_LongTermDebtCurrent
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2,836us-gaap_LongTermDebtCurrent
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| Long-term debt, net |
1,036,056us-gaap_LongTermDebtNoncurrent
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1,045,144us-gaap_LongTermDebtNoncurrent
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| 2021 Notes | Line of Credit |
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| Debt Instrument [Line Items] |
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| Long-term debt, gross |
325,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_SeniorNotesDueTwentyTwentyOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
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[1] |
325,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_SeniorNotesDueTwentyTwentyOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
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[1] |
| 2019 Notes |
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| Debt Instrument [Line Items] |
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| Less unamortized discount paid on the 2019 Notes |
2,118us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = gncma_SeniorNotesDueTwentyNineteenMember
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2,445us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = gncma_SeniorNotesDueTwentyNineteenMember
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| 2019 Notes | Line of Credit |
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| Debt Instrument [Line Items] |
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| Long-term debt, gross |
425,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_SeniorNotesDueTwentyNineteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
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[2] |
425,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_SeniorNotesDueTwentyNineteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
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[2] |
| Senior Credit Facility | Notes Payable to Banks |
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| Debt Instrument [Line Items] |
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| Long-term debt, gross |
279,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_SeniorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
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[3] |
261,000us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_SeniorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
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[3] |
| Wells Fargo Note | Notes Payable to Banks |
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| Debt Instrument [Line Items] |
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| Long-term debt, gross |
9,767us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_WellsFargoNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
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[4] |
0us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_WellsFargoNoteMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
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[4] |
| Rural Utilities Service (RUS) debt | Notes Payable to Banks |
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| Debt Instrument [Line Items] |
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| Long-term debt, gross |
$ 29us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_RuralUtilityServiceMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
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[5] |
$ 39,425us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = gncma_RuralUtilityServiceMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
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[5] |
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