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Stockholders' Equity (Dividends) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 23, 2012
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Cash Dividends [Abstract]        
Cash dividends paid, net of reinvested stock dividends   $ 2,174,000 $ 2,011,000  
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) $ 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       $ 15,200,000
Common stock issued under dividend reinvestment plan (in shares)       1,595,000