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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]                      
Income (loss) from continuing operations                 $ 25,377,000 $ (26,068,000) $ (6,378,000)
Preferred stock dividends                 (14,819,000) (14,200,000) (10,196,000)
Preferred stock redemption costs                 (4,998,000)    
Net loss attributable to noncontrolling interests (30,690,000.00) (2,298,000.00) (5,895,000.00) 4,868,000.00 3,427,000.00 71,265,000.00 24,729,000.00 9,093,000.00 375,000 920,000  
Net earnings allocated to unvested shares                 (806,000) (810,000)  
Income (loss) from continuing operations attribtuable to common shareholders                 5,129,000 (40,158,000)  
Results from discontinued operations, net of noncontrolling interests                 3,954,000 (78,413,000)  
Net income (loss) attributable to common shareholders, basic and diluted                 $ 9,083,000 $ (118,571,000)  
Weighted average number of vested common shares outstanding                 68,017,000 66,387,000 63,843,000
Earnings (loss) per common share, basic and diluted                      
Continuing operations                 $ 0.07 $ (0.61) $ (0.24)
Discontinued operations                 $ 0.06 $ (1.18) $ (0.57)
Earnings (loss) per common share, basic and diluted $ 0.31 [1] $ (0.07) [1] $ 0.01 [1] $ (0.14) [1] $ (0.12) [1] $ (1.05) [1] $ (0.41) [1] $ (0.18) [1] $ 0.13 $ (1.79) $ (0.81)
[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.