Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
5-1/2% convertible preferred stock, cumulative, voting, par value
5-1/2% convertible preferred stock, cumulative, voting, shares authorized	2,000,000	2,000,000
5-1/2% convertible preferred stock, cumulative, voting, shares issued	518,293	518,293
5-1/2% convertible preferred stock, cumulative, voting, shares outstanding	518,293	518,293
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	11,831,942	11,709,312
Treasury stock, shares	1,482,657	1,462,980