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Stockholders' Equity (Dividends) (Details) - USD ($)
 12 Months Ended
Jan. 23, 2012
Dec. 31, 2017
Dec. 31, 2016
Cash Dividends [Abstract]      
Cash dividends paid, net of reinvested stock dividends   $ 3,621,000 $ 4,517,000
Annualized dividend rate (in dollars per share)   $ 0.40  
Dividend Reinvestment Plan [Abstract]      
Registered shares of common stock pursuant to dividend reinvestment plan (in shares) 3,000,000    
Percentage of purchase price per share (in hundredths) 95.00%    
Former sales price per share (in dollars per share) $ 10.00    
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   $ 17,424,399  
Dividends declared, paid and reinvested, value   1,834,147