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Commitments and Contingencies - Universal Services Fund Liability (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2013 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2015 | Jun. 12, 2015 | Sep. 30, 2014 | Dec. 31, 2012
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrued federal fees |  | $ 2,742,000 | $ 2,742,000 | $ 5,684,000 |  |  |  |  |
Reversal of accrued federal fees |  | 3,100,000 | 3,114,000 | 0 | $ 0 |  |  |  |
Promissory note payable |  | 33,714,000 | 33,714,000 |  |  |  |  |  |
FCC Enforcement Bureau Civil Penalty |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrued liability for civil penalty |  |  |  |  |  |  |  | $ 2,000,000 |
General and Administrative |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
interest and penalty expense |  |  | 600,000 | 500,000 | $ 500,000 |  |  |  |
2003 through 2012 | USF Obligations |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrued federal fees |  |  |  |  |  |  |  |  | $ 8,100,000
Undisputed portion [Member] | 2003 through 2012 | USF Obligations |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrued federal fees |  |  |  |  |  |  |  |  | 4,700,000
Payments for state and local taxes on usage-based fees | $ 600,000 |  |  |  |  |  |  |  |
Disputed portion [Member] | 2003 through 2012 | USF Obligations |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrued federal fees |  | 2,500,000 | 2,500,000 | 4,900,000 |  |  |  |  | 3,400,000
Disputed portion [Member] | 2003 through 2007 | USF Obligations |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrued federal fees |  |  |  |  |  |  |  |  | $ 800,000
Promissory Note to USAC | USF Obligations |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Promissory note issued | $ 4,100,000.0 |  |  |  |  |  |  |  |
FCC Enforcement Bureau Civil Penalty |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Civil penalty |  |  |  |  |  |  | $ 2,000,000 |  |
Notes Payable |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Promissory note payable |  | 1,120,000 | 1,120,000 | 25,626,000 |  |  |  |  |
Notes Payable | Promissory Note to USAC |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Promissory note payable |  | 120,000 | 120,000 | 1,459,000 |  |  |  |  |
Notes Payable | FCC Enforcement Bureau Civil Penalty |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Promissory note payable |  | $ 1,000,000 | $ 1,000,000 | $ 1,667,000 |  |  |  |  |
Civil penalty |  |  |  |  |  | $ 2,000,000 |  |  |

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