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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income (loss) $ 9,937,000 $ (4,389,000) $ (6,683,000) $ 7,556,000
Preferred stock dividends (2,688,000) (3,602,000) (5,487,000) (7,204,000)
Preferred stock redemptions costs     (3,507,000)  
Net (income) attributable to noncontrolling interests (160,000) (85,000) (208,000) (254,000)
Net earnings allocated to unvested shares (294,000) (190,000) (412,000) (375,000)
Net income (loss) attributable to vested common shares $ 6,795,000 $ (8,266,000) $ (16,297,000) $ (277,000)
Weighted average number of vested common shares outstanding, basic 88,011,000 81,771,000 87,817,000 81,753,000
Assumed vesting of market performance-based restricted stock units 155,000   78,000  
Weighted average number of vested common shares outstanding, diluted 88,166,000 81,771,000 87,895,000 81,753,000
Net income (loss) per common share attributable to common shareholders, basic $ 0.08 $ (0.10) $ (0.19) $ 0.00
Net income (loss) per common share attributable to common shareholders, diluted $ 0.08 $ (0.10) $ (0.19) $ 0.00