Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	26,761,990	26,731,360
Treasury stock, common shares	4,320,462	4,320,462
Series B Preferred Stock [Member]
Preferred stock, shares outstanding	20,000	20,000
Preferred stock, shares issued	20,000	20,000
Convertible preferred stock dividend rate	12.00%	12.00%
Series B cumulative, convertible preferred stock, par value	$ 100	$ 100
Series D Preferred Stock [Member]
Preferred stock, shares outstanding	1,000,000	1,000,000
Preferred stock, shares issued	1,000,000	1,000,000
Convertible preferred stock dividend rate	6.00%	6.00%
Series D cumulative, convertible Class C preferred stock, par value	$ 0	$ 0