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Stockholders' Equity (Dividends) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 23, 2012
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash Dividends [Abstract]            
Payments of dividends   $ 0 $ 0 $ 0    
Dividends declared   $ 0 $ 0 $ 0    
Cash dividends paid, net of reinvested stock dividends           $ 2,384,000
Annualized dividend rate (in dollars per share)           $ 0.10
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) $ 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         $ 17,400,000  
Common stock issued under dividend reinvestment plan (in shares)   1,834,147     1,834,147  
Stock issued during period, shares dividend reinvestment plan         0