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Net Income per Common Share (Narrative) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Anti-dilutive outstanding options 636 1,280 1,012 5,019
Preferred stock, shares outstanding 7,807   7,807  
Series F Preferred Stock [Member]        
Preferred stock, shares outstanding 6,465   6,465  
Preferred stock, dividend rate     6.00%