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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