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Earnings Per Share (Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
 [1]
Sep. 30, 2015
 [1]
Jun. 30, 2015
 [1]
Mar. 31, 2015
 [1]
Dec. 31, 2014
 [1]
Sep. 30, 2014
 [1]
Jun. 30, 2014
 [1]
Mar. 31, 2014
 [1]
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Income from continuing operations                 $ 21,616,000 $ 17,611,000 $ 4,519,000
Preferred stock dividends                 (14,408,000) (14,408,000) (14,413,000)
Preferred stock redemption costs                     (1,166,000)
Net loss attributable to noncontrolling interests                 366,000 358,000 247,000
Net earnings allocated to unvested shares                 (701,000) (734,000) (758,000)
Income (loss) from continuing operations attributable to vested common shares                 6,873,000 2,827,000 (11,571,000)
Income from discontinued operations, net of noncontrolling interests, attributable to vested common shares                 164,000 11,012,000 9,682,000
Net income (loss) attributable to vested common shares outstanding                 $ 7,037,000 $ 13,839,000 $ (1,889,000)
Weighted average number of vested common shares outstanding                 81,356,000 75,311,000 68,381,000
Earnings per vested common share, basic and diluted                      
Continuing operations                 $ 0.09 $ 0.04 $ (0.17)
Discontinued operations                 0.00 0.14 0.14
Earnings (loss) per vested common share, basic and diluted $ 0.04 $ 0.03 $ 0.02 $ 0.00 $ 0.01 $ 0.03 $ 0.17 $ (0.03) $ 0.09 $ 0.18 $ (0.03)
[1] Differences between the sum of the four quarterly per share amounts and the annual per share amounts are attributable to the effect of the weighted average outstanding share calculations for the respective periods.