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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Income (loss) from continuing operations                 $ 5,037,000 $ 23,836,000 $ (28,139,000)
Preferred stock dividends                 (14,413,000) (14,819,000) (14,200,000)
Preferred stock redemption costs                 (1,166,000) (4,998,000)  
Net loss attributable to noncontrolling interests (5,802,000) (62,000) (4,486,000) (3,852,000) (30,690,000) (2,298,000) (5,895,000) 4,868,000 247,000 375,000 920,000
Net earnings allocated to unvested shares                 (758,000) (806,000) (810,000)
(Loss) income from continuing operations attribtuable to common shareholders                 (11,053,000) 3,588,000 (42,229,000)
Results from discontinued operations, net of noncontrolling interests                 9,164,000 5,495,000 (76,342,000)
Net (loss) income attributable to common shareholders, basic and diluted                 $ (1,889,000) $ 9,083,000 $ (118,571,000)
Weighted average number of vested common shares outstanding                 68,381,000 68,017,000 66,387,000
Continuing operations                 $ (0.16) $ 0.05 $ (0.64)
Discontinued operations                 $ 0.13 $ 0.08 $ (1.15)
(Loss) earnings per common share, basic and fully diluted $ 0.03 [1] $ (0.05) [1] $ 0.01 [1] $ (0.02) [1] $ 0.31 [1] $ (0.07) [1] $ 0.01 [1] $ (0.14) [1] $ (0.03) $ 0.13 $ (1.79)
[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.