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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 27,109,544 26,968,212
Treasury stock, common shares 4,320,462 4,320,462
Series B Preferred Stock [Member]    
Convertible preferred stock dividend rate 12.00% 12.00%
Preferred stock, shares issued 20,000 20,000
Preferred stock, shares outstanding 20,000 20,000
Series B cumulative, convertible preferred stock, par value $ 100 $ 100
Series D Preferred Stock [Member]    
Convertible preferred stock dividend rate 6.00% 6.00%
Preferred stock, shares issued 1,000,000 1,000,000
Preferred stock, shares outstanding 1,000,000 1,000,000
Series D cumulative, convertible Class C preferred stock, par value