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Stockholders' Equity (Dividends) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 23, 2012
Mar. 22, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Dividends [Abstract]        
Cash dividends paid     $ 0  
Cash dividends paid, net of reinvested stock dividends       $ 3,621,000
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  
Dividend reinvestments     $ 0  
Common stock issued under dividend reinvestment plan     $ 17,424,399  
Common stock issued under dividend reinvestment plan (in shares)     1,834,147  
Subsequent Event [Member]        
Cash Dividends [Abstract]        
Cash dividends paid   $ 1,075,000    
Annualized dividend rate (in dollars per share)   $ 0.06