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Earnings Per Share (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net (loss) income $ (6,009,000) $ 5,544,000 $ (8,107,000) $ 8,533,000
Preferred stock dividends (2,688,000) (2,688,000) (5,376,000) (5,376,000)
Net (income) attributable to noncontrolling interests (88,000) (161,000) (236,000) (268,000)
Net earnings allocated to unvested shares (28,000) (138,000) (182,000) (282,000)
Net (loss) income attributable to vested common shares $ (8,813,000) $ 2,557,000 $ (13,901,000) $ 2,607,000
Weighted average number of vested common shares outstanding, basic and diluted 86,509,000 86,260,000 86,439,000 86,420,000
Net (loss) income per common share attributable to common shareholders, basic and diluted $ (0.10) $ 0.03 $ (0.16) $ 0.03