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Stockholders' Equity (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
ATM Sales Program
May 06, 2010
ATM Sales Program
May 15, 2013
May 2013 Public Offering
May 15, 2013
May 2013 Public Offering Underwriter Overallotment Option
Equity Offerings                    
Common stock, shares outstanding 100,187,405       100,187,405 82,937,405        
Maximum aggregate gross sales price of common stock             $ 34,300,000 $ 75,000,000    
Shares of common stock sold                 17,250,000 2,250,000
Price per share of common stock sold (in dollars per share)                 $ 14.00  
Proceeds from the issuance of common stock, net         241,500,000       230,700,000  
Offering related expenses incurred         10,789,000       10,800,000  
Dividends declared and paid                    
Dividends Per Share (in dollars per share) $ 0.19 $ 0.19 $ 0.19 $ 0.19            
Total Dividends $ 15,758,000 $ 15,758,000 $ 15,758,000 $ 15,758,000