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Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
item
Mar. 31, 2012
Earnings Per Share    
Two-class method assumption, percentage of net income distributed as dividends to each class of stock 100.00%  
Numerator:    
Net income (loss) $ 28,926 $ (12,968)
Income from consolidated joint venture attributable to non-controlling interest (297) (560)
Distributions to non-controlling interest (8) (8)
Preferred stock dividends and redemption charge (10,903) (7,437)
Undistributed income allocated to unvested restricted stock compensation (218) 0
INCOME AVAILABLE (LOSS ATTRIBUTABLE) TO COMMON STOCKHOLDERS $ 17,500 $ (20,973)
Denominator:    
Weighted average basic and diluted common shares outstanding 151,076 117,426
Basic and diluted earnings available (loss attributable) to common stockholders per common share $ 0.12 $ (0.18)
Segment Reporting    
Number of operating segments 1