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Stockholders' Equity (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Dec. 31, 2013
May 15, 2013
May 2013 Public Offering
May 15, 2013
May 2013 Public Offering Underwriter Overallotment Option
Sep. 30, 2014
ATM Sales Program
May 06, 2010
ATM Sales Program
Equity Offerings                        
Common stock, shares outstanding (in shares) 100,187,405             100,187,405        
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      
Maximum aggregate gross sales price of common stock                     34,300,000 75,000,000
Dividends declared and paid                        
Dividends Per Share (in dollars per share) $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19            
Total Dividends $ 19,036,000 $ 19,035,000 $ 19,036,000 $ 19,036,000 $ 15,758,000 $ 15,758,000