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Subsequent Events (Details) - U.S. Cellular Term loan facility - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2016
Subsequent Events |  |  |
Debt Instrument Frequency Of Periodic Payment |  | quarterly |
Expected event |  |  |
Subsequent Events |  |  |
Debt Instrument Periodic Payment |  |  | $ 2.8
Subsequent event |  |  |
Subsequent Events |  |  |
Proceeds from Term Loan borrowings | $ 225.0 |  |

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