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Long-Term Debt - Narrative (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 18, 2015 USD ($) facility | Sep. 30, 2018 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Number of credit facilities | facility | 3 |  |  |  |  |
Proceeds from revolving credit facility borrowings |  |  |  | $ 15,000,000 | $ 0 | $ 0
Total debt, net of unamortized loan fees |  |  |  | 770,242,000 | 821,958,000 |
Unamortized loan fees |  |  |  | $ 14,994,000 | $ 14,542,000 |
Weighted average interest rate |  |  |  | 3.97% |  |
Total leverage ratio through December 30, 2019 | 3.25 |  |  |  |  |
Total leverage ratio thereafter | 3.00 |  |  |  |  |
Debt service coverage ratio, actual |  |  |  | 3.63 |  |
Minimum liquidity balance | $ 25,000,000 |  |  | $ 25,000,000 |  |
Accrued in anticipation of early distribution of patronage credit |  |  |  | $ 2,800,000 |  |
Percentage of patronage credit paid in cash |  |  |  | 75.00% |  |
Percentage of patronage credit paid in shares |  |  |  | 25.00% |  |
One-time cash distribution from CoBank |  | $ 200,000 |  |  |  |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed interest rate | 1.16% |  |  |  |  |
Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amended 2016 Credit Agreement, limit of dividends paid, distributions and redemption of capital stock |  |  |  | $ 25,000,000 |  |
Amended 2016 Credit Agreement, limit of consolidated net income (as a percent) |  |  |  | 60.00% |  |
Total leverage ratio from closing date through December 30, 2018 | 3.50 |  |  |  |  |
Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt service coverage ratio, actual | 2.00 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term of credit facility | 5 years |  |  |  |  |
Maximum borrowing capacity | $ 75,000,000 |  |  |  |  |
Incremental Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of credit facilities | facility | 1 |  |  |  |  |
Maximum borrowing capacity | $ 150,000,000 |  |  |  |  |
Amended 2016 Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Shift in principal amount from Term Loan A-1 to Term Loan A-2 |  |  |  | $ 108,800,000 |  |
Term loan A-1 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term of credit facility | 5 years |  |  |  |  |
Maximum borrowing capacity | $ 485,000,000 |  |  |  |  |
Quarterly principal payment period one |  |  |  | 3,600,000 |  |
Quarterly principal payment period two |  |  |  | 7,300,000 |  |
Quarterly principal payment period three |  |  |  | $ 10,900,000 |  |
Term loan A-1 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 2.75% |  |  | 1.75% |  |
Term loan A-1 | Ntelos Holding, Corp |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility amount borrowed | $ 485,000,000 |  |  |  |  |
Term loan A-2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term of credit facility | 7 years |  |  |  |  |
Maximum borrowing capacity | $ 400,000,000 |  |  |  |  |
Proceeds from revolving credit facility borrowings |  |  | $ 25,000,000 |  |  | $ 50,000,000
Quarterly principal payment period one |  |  |  | $ 1,200,000 |  |
Term loan A-2 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  | 2.00% |  |
Term loan A-2 | Ntelos Holding, Corp |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility amount borrowed | $ 325,000,000 |  |  |  |  |
Term loan A-2 | Delayed Draw Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit facility remaining borrowing capacity | $ 75,000,000 |  |  | $ 75,000,000 |  |

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- Definition Amount after unamortized loan fees of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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