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Net Income per Common Share (Narrative) (Details) - shares
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Anti-dilutive outstanding options 687 21,026  
Preferred stock, shares outstanding 8,326   8,340
Series F Preferred Stock [Member]      
Preferred stock, shares outstanding 6,465    
Preferred stock, dividend rate 6.00% 6.00% 6.00%