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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Net income (loss) $ 5,544,000 $ 9,937,000 $ 8,533,000 $ (6,683,000)
Preferred stock dividends (2,688,000) (2,688,000) (5,376,000) (5,487,000)
Preferred stock redemptions costs       (3,507,000)
Net (income) attributable to noncontrolling interests (161,000) (160,000) (268,000) (208,000)
Net earnings allocated to unvested shares (138,000) (294,000) (282,000) (412,000)
Net income (loss) attributable to vested common shares $ 2,557,000 $ 6,795,000 $ 2,607,000 $ (16,297,000)
Weighted average number of vested common shares outstanding, basic 86,260,000 88,011,000 86,420,000 87,817,000
Assumed vesting of market performance-based restricted stock units   155,000    
Weighted average number of vested common shares outstanding, diluted 86,260,000 88,166,000 86,420,000 87,817,000
Net income (loss) per common share attributable to common shareholders, basic $ 0.03 $ 0.08 $ 0.03 $ (0.19)
Net income (loss) per common share attributable to common shareholders, diluted $ 0.03 $ 0.08 $ 0.03 $ (0.19)