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Stockholders' Equity (Dividends) (Details) - USD ($)
 3 Months Ended
Jan. 23, 2012
Mar. 31, 2016
Mar. 31, 2015
Cash Dividends [Abstract]      
Cash dividends paid, net of reinvested stock dividends   $ 1,065,000 $ 997,000
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) 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   $ 14,600,000  
Common stock issued under dividend reinvestment plan (in shares)   1,533,000