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Stockholders' Equity (Dividends) (Details) - USD ($)
 3 Months Ended 9 Months Ended 44 Months Ended
Jan. 23, 2012
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Cash Dividends [Abstract]            
Cash dividends paid, net of reinvested stock dividends       $ 3,292,000 $ 3,830,000  
Annualized dividend rate (in dollars per share)       $ 0.471 $ 0.543  
Dividend Reinvestment Plan [Abstract]            
Registered shares of common stock pursuant to dividend reinvestment plan (in shares) 1,500,000          
Percentage of purchase price per share (in hundredths) 95.00%          
Former sales price per share (in dollars per share) $ 9.50          
Payment of sales commission or dealer manager fee $ 0          
Notice period for amendments to Dividend Reinvestment Plan       30 days    
Common stock issued under dividend reinvestment plan           $ 13,200,000
Common stock issued under dividend reinvestment plan (in shares)           1,398,000
Redeemable Convertible Series 6.3% Preferred Stock [Member]            
Cash Dividends [Abstract]            
Cash dividends paid   $ 0 $ 13,000 $ 0 $ 65,000