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Description of Business and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounting Policies [Abstract] |  |  |  |
USF contributions and other regulatory costs, before reversal |  | $ 7,700 |  |
Reversal of accrued federal fees | $ 3,100 | 3,114 | $ 0 | $ 0
USF contributions and other regulatory costs |  | $ 4,600 | $ 6,200 | $ 4,400

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- Definition Cost of Revenue, Universal Service Fund Contributions and Other Regulatory Costs, Gross + References No definition available. + Details
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- Definition Increase (Decrease) of Accrued Federal Fees + References No definition available. + Details
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