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Debt - Senior Notes and Senior Credit Facility (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Dec. 18, 2020 | Oct. 15, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Outstanding principal |  |  | $ 4,543,809 |
Fair value of debt |  |  | 1,399,600 | $ 1,445,775
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair value of debt |  |  | 531,100 |
Senior Notes | GCI Liberty Inc |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding principal | $ 600,000 |  |  |
Interest rate (as a percent) | 4.75% |  |  |
Aggregate unamortized premium |  |  | 34,700 |
Senior Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding principal |  |  | 523,000 |
Senior Credit Facility | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total threshold ratio |  | 6.50 |  |
Secured leverage ratio |  | 4.50 |  |
First lien leverage ratio |  | 4.00 |  |
Amount available for borrowing |  |  | 421,800 |
Senior Credit Facility | Revolving Credit Facility | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding principal |  |  | 125,000 |
Principal amount |  | $ 550,000 |  |
Repayment of debt |  |  | 180,000 |
Senior Credit Facility | Revolving Credit Facility | LIBOR | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate basis |  | LIBOR |  |
Senior Credit Facility | Revolving Credit Facility | LIBOR | Minimum | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.50% |  |
Senior Credit Facility | Revolving Credit Facility | LIBOR | Maximum | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 2.75% |  |
Senior Credit Facility | Revolving Credit Facility | Alternate base rate | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate basis |  | alternate base rate |  |
Senior Credit Facility | Revolving Credit Facility | Alternate base rate | Minimum | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.50% |  |
Senior Credit Facility | Revolving Credit Facility | Alternate base rate | Maximum | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.75% |  |
Senior Credit Facility | Standby Letters of Credit | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding principal |  |  | 3,200 |
Principal amount |  | $ 25,000 |  |
Senior Credit Facility | Term Loan B | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding principal |  |  | $ 398,000 |
Principal amount |  | $ 400,000 |  |
Percentage of principle amount of debt |  | 0.25% |  |
Senior Credit Facility | Term Loan B | LIBOR | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate basis |  | LIBOR |  |
Basis spread on variable rate |  | 2.75% |  |
Senior Credit Facility | Term Loan B | LIBOR | Minimum | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) |  | 0.75% |  |
Senior Credit Facility | Term Loan B | Alternate base rate | GCI, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate basis |  | alternate base rate |  |
Basis spread on variable rate |  | 1.75% |  |
Wells Fargo Notes Payable | GCI Liberty Inc |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding principal | $ 6,400 |  |  |
Wells Fargo Notes Payable | LIBOR | GCI Liberty Inc |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate basis | LIBOR |  |  |
Basis spread on variable rate | 2.25% |  |  |

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