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Capital Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended3 Months Ended9 Months Ended0 Months Ended3 Months Ended
Jun. 27, 2011
Apr. 07, 2011
Sep. 09, 2011
Jun. 17, 2011
Mar. 25, 2011
Sep. 09, 2011
Sep. 10, 2010
Dec. 31, 2010
Sep. 20, 2011
Dividend Paid [Member]
Mar. 25, 2011
Follow On Public Offering [Member]
Capital Stock (Textuals) [Abstract]          
Common stock, shares authorized  200,000,000  200,000,000 200,000,000  
Common stock, par value  $ 0.01  $ 0.01 $ 0.01  
Common stock, shares sold         12,418,662
Underwriters overallotment of shares         1,418,662
Common stock offering price         $ 12.07
Net proceeds after deduction of offering cost     $ 149,674$ 209,817  $ 149,700
Common Stock, Dividends, Per Share, Declared  $ 0.08$ 0.08$ 0.08     
Dividends Payable, Date of Record, Day, Month and YearSep. 09, 2011Jun. 17, 2011Mar. 25, 2011
Dividends Payable, Date to be Paid, Day, Month and YearJun. 27, 2011Apr. 07, 2011Sep. 20, 2011
Common Stock, Dividends, Per Share, Cash Paid  $ 0.08$ 0.08$ 0.08     
Preferred stock, shares authorized  10,000,000  10,000,000 10,000,000  
Preferred stock, par value  $ 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