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Stockholders' Equity (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
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 (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            
Total Dividends $ 19,035,000 $ 19,036,000 $ 15,758,000 $ 15,758,000