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Other Income (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 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   $ 11   $ 213 $ 11
Tower in Keene New Hampshire [Member]            
Other Income [Line Items]            
Other income (expense)   $ 208