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Other Income (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Other Income [Line Items] |  |  |  |  |
Proceeds from sale of land and buildings |  | $ 1,700 |  |  |
Gain on sale of land and buildings |  |  |  | $ 1,400 |
Cash proceeds from insurance settlement |  |  |  | 208 |
Other income (expense) | $ 0 |  | $ 0 | $ 213 | $ 0
Tower in Keene New Hampshire [Member] |  |  |  |  |
Other Income [Line Items] |  |  |  |  |
Other income (expense) |  | $ 208 |  |  |

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