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Customer Concentration (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) customer megahertz | Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Dec. 31, 1999 renewal megahertz
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Megahertz spectrum range used | 1,900 |  |  | 1,900
Number of contract renewals | renewal |  |  |  | 2
Length of renewals |  |  |  | 10 years
Right or obligation to sell business, percentage of EBV |  |  |  | 90.00%
Maximum |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Megahertz spectrum range used | 2,500,000 |  |  | 2,500,000
Minimum |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Megahertz spectrum range used | 800 |  |  | 800
Accounts Receivable | Customer Concentration Risk |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Concentration risk, amount | $ | $ 43,227 | $ 43,405 |  |
Concentration risk | 79.00% | 80.00% |  |
Sales Revenue, Goods, Net | Customer Concentration Risk |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |
Number of major customers | customer | 1 |  |  |
Concentration risk | 68.00% | 72.00% | 69.00% |

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