Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Stockholders' equity:
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	26,496,670	25,476,534
Less treasury stock at cost:
Treasury stock, common shares	4,320,462	4,320,462
Series B Preferred stock
Stockholders' equity:
Convertible preferred stock dividend rate	$ 12.00%	$ 12.00%
Series B cumulative, convertible preferred stock, par value	$ 100	$ 100
Preferred stock, shares issued	20,000	20,000
Preferred stock, shares outstanding	20,000	20,000
Series D Preferred stock
Stockholders' equity:
Convertible preferred stock dividend rate	$ 6.00%	$ 6.00%
Series D cumulative, convertible Class C preferred stock, par value	$ 0	$ 0
Preferred stock, shares issued	1,000,000	1,000,000
Preferred stock, shares outstanding	1,000,000	1,000,000