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Stockholders' Equity (Dividends) (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 23, 2012
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Cash Dividends [Abstract]        
Cash dividends paid, net of reinvested stock dividends     $ 2,011,000 $ 2,525,000
Annualized dividend rate (in dollars per share)     $ 0.471 $ 0.543
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) $ 9.5      
Notice period for amendments to Dividend Reinvesment Plan     30 days  
Common stock issued under dividend reinvestment plan     $ 12,600,000  
Common stock issued under dividend reinvestment plan (in shares)     1,329,000  
Redeemable Convertible Series 6.3% Preferred Stock [Member]        
Cash Dividends [Abstract]        
Cash dividends paid   $ 26,000 $ 52,000