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Shareholders' Equity (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
OP units converted 1,134,000  
Mezzanine Operating Partnership Units [Member]
    
OP units converted 564,000  
Carrying value of OP Units reclassified to equity $ 3,900,000  
Series B [Member]
    
Public offering, shares 400,000  
Liquidation preference, per share $ 25.00 $ 25.00
Redemption price per share $ 25.00  
Public offering, per share $ 23.00  
Public offering, realized net proceeds, net offering expenses 8,600,000  
ATM equity program additional shares available to sell 4,000,000  
ATM equity program, shares issued 53,000  
ATM equity program, weighted average price per share $ 23.15  
ATM equity program, realized net proceeds, net offering expenses 1,200,000  
Dividend rate percentage 7.25%  
Series A [Member]
    
Liquidation preference, per share $ 25.00 $ 25.00
Dividend rate percentage 8.875%  
Shares of Redeemable Preferred Stock redeemed and purchased 380,000  
Total cash outlay for Redeemable Preferred Stock shares redeemed and purchased 9,600,000  
Preferred stock accrued dividends $ 89,000