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Earnings Per Share (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share [Abstract]        
Income (loss) from continuing operations $ 1,073,000 $ (7,221,000) $ (2,191,000) $ (21,157,000)
Preferred stock dividends (3,877,000) (3,580,000) (11,015,000) (10,621,000)
Preferred stock redemption costs (173,000)   (555,000)  
Net loss attributable to noncontrolling interests 127,000 261,000 424,000 785,000
Net earnings allocated to unvested shares (178,000) (266,000) (626,000) (546,000)
(Loss) from continuing operations attribtuable to common shareholders (3,028,000) (10,806,000) (13,963,000) (31,539,000)
Results from discontinued operations, net of noncontrolling interests (1,449,000) (59,565,000) 934,000 (79,089,000)
Net (loss) attributable to common shareholders, basic and diluted $ (4,477,000) $ (70,371,000) $ (13,029,000) $ (110,628,000)
Weighted average number of vested common shares outstanding 68,232,000 66,800,000 67,932,000 66,253,000
Continuing operations $ (0.05) $ (0.16) $ (0.20) $ (0.48)
Discontinued operations $ (0.02) $ (0.89) $ 0.01 $ (1.19)
Earnings (loss) per common share, basic and diluted $ (0.07) $ (1.05) $ (0.19) $ (1.67)