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Commitments and Contingencies - Universal Services Fund Liability (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Dec. 31, 2012
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrued federal fees |  |  | $ 1,151 | $ 2,742 |  |  |
Increase in accrued federal fees |  |  | 0 | $ (3,114) | $ 0 |  |
Promissory note payable |  |  | 32,927 |  |  |  |
Year 2003 through 2012 | USF Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrued federal fees |  |  |  |  |  |  | $ 8,100
Undisputed portion | Year 2003 through 2012 | USF Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrued federal fees |  |  |  |  |  |  | 4,700
Payments on usage-based fees | $ 600 |  |  |  |  |  |
Disputed portion | Year 2003 through 2012 | USF Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrued federal fees |  | $ 3,900 |  |  |  |  | $ 3,400
USF credits |  |  |  |  |  | $ 3,100 |
Disputed liability related to reversal of interest and penalties |  |  |  |  |  | 3,100 |
Disputed portion | Year 2008 Through 2012 | USF Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Increase in accrued federal fees |  | $ 500 |  |  |  |  |
Disputed portion | Year 2003 To Year 2007 | USF Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrued federal fees |  |  | 800 |  |  | $ 800 |
Promissory Note | USF Obligations |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Promissory note payable | $ 4,100 |  |  |  |  |  |
Universal Services Fund |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
USF credits |  |  | $ 700 |  |  |  |

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