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Shareholders' Equity (Details) (USD $)
 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Mezzanine Operating Partnership Units [Member]
Sep. 30, 2012
Series B [Member]
Sep. 14, 2012
Series B [Member]
Sep. 11, 2012
Series B [Member]
May 15, 2012
Series B [Member]
Dec. 31, 2011
Series B [Member]
Oct. 31, 2012
Series A [Member]
Sep. 30, 2012
Series A [Member]
Dec. 31, 2011
Series A [Member]
OP units converted 1,134,000 564,000                
Carrying value of OP Units reclassified to equity   $ 3,900,000                
Public offering, shares       630,000 4,200,000 400,000        
Dividend rate percentage     7.25%           8.875%  
Public offering, per share         $ 23.94 $ 23.00        
Public offering, realized net proceeds, net offering expenses       14,500,000 96,800,000 8,600,000        
ATM equity program, shares issued     199,000              
ATM equity program, weighted average price per share     $ 23.23              
ATM equity program, realized net proceeds, net offering expenses     4,500,000              
Liquidation preference, per share     $ 25.00       $ 25.00   $ 25.00 $ 25.00
Redemption price per share     $ 25.00              
Shares of Redeemable Preferred Stock redeemed and purchased               4,500,000 487,000  
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased               114,100,000 12,400,000  
Preferred stock redemption costs                 181,000  
Preferred stock accrued dividends               $ 1,500,000 $ 141,000