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Noncontrolling Interests (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Noncontrolling Interest [Line Items]    
Net Income (Loss) Available to Common Stockholders, Basic $ (1,199,000) $ 80,848,000
Change in equity from net loss income attributable to common stockholders and conversion of operating partnership units to companys common stock 450,000 80,848,000
Redeemable noncontrolling interests in the Operating Partnership    
Mark to market adjustment to redeemable noncontrolling interests in the OP 6,144,000  
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership (1,649,000) 0
Net (income)/loss attributable to redeemable non-controlling interests in OP (45,000) 3,420,000
Distributions to redeemable noncontrolling interests in the OP (2,360,000)  
Allocation of other comprehensive (loss)/income 87,000 (67,000)
Redeemable non-controlling interests in operating partnership 225,595,000 223,418,000
Net income attributable to non-controlling interests $ 4,000 $ 52,000