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Commitments and Contingencies - Universal Services Fund Liability (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2013 | Mar. 31, 2013 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2012
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued federal fees |  |  | $ 1,638 | $ 1,151 |  |
Principal |  |  | 258,781 |  |  |
2003 through 2012 | USF obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued federal fees |  |  |  |  |  | $ 8,100
2003 through 2012 | Undisputed portion | USF obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued federal fees |  |  |  |  |  | 4,700
Payments | $ 600 |  |  |  |  |
2003 through 2012 | Disputed portion | USF obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued federal fees |  | $ 3,900 |  |  |  | $ 3,400
Disputed liability related to the reversal of interest and penalties |  |  |  |  | $ 3,100 |
USF credits |  |  |  |  | 3,100 |
Year 2003 To Year 2007 | Disputed portion | USF obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued federal fees |  |  | 800 |  | $ 800 |
2008 through 2012 | Disputed portion | USF obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Increase (decrease) in accrual federal fees |  | $ 500 |  |  |  |
Promissory Note | USF obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Principal | $ 4,100 |  |  |  |  |
Universal Services Fund |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
USF credits |  |  | $ 700 |  |  |

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