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Capital Stock (Details) (USD $)
 0 Months Ended 9 Months Ended
Sep. 19, 2012
Sep. 07, 2012
Jul. 11, 2012
Jul. 12, 2012
May 29, 2012
May 15, 2012
Apr. 04, 2012
Mar. 23, 2012
Jan. 10, 2012
Dec. 29, 2011
Sep. 07, 2012
Sep. 09, 2011
Jul. 09, 2012
Dec. 31, 2011
Equity [Abstract]                            
Common stock, par value (in dollars per share)   $ 0.01                 $ 0.01     $ 0.01
Common stock, shares authorized   400,000,000                 400,000,000   200,000,000 400,000,000
Stock Issued During Period, Shares, New Issues     20,000,000 7,211,538                    
Proceeds from Issuance of Common Stock     $ 199,800,000               $ 199,831,000 $ 149,674,000    
Stock Issued During Period, Value, New Issues       $ 75,000,000                    
Lock up agreement period (in days)       150 days                    
Dividends Payable, Date to be Paid, Day, Month and Year Sep. 19, 2012       May 29, 2012   Apr. 04, 2012   Jan. 10, 2012          
Dividends Payable, Date of Record, Day, Month and Year   Sep. 07, 2012       May 15, 2012   Mar. 23, 2012   Dec. 30, 2011        
Common stock, dividends, per share, declared (in dollars per share) $ 0.08       $ 0.08   $ 0.08   $ 0.08          
Preferred stock, shares authorized   10,000,000                 10,000,000     10,000,000
Preferred stock, par value (in dollars per share)   $ 0.01                 $ 0.01     $ 0.01
Preferred Stock, shares outstanding   0                 0     0
Units of Partnership Interest, Amount   0                 0     0
Operating Partnership Units Option To Redeem For Common Stock Ratio                     1