CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data	Sep. 30, 2011	Dec. 31, 2010
Stockholders' equity
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, shares authorized (in shares)	1,000	1,000
Preferred Stock, shares issued (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common Stock, shares authorized (in shares)	50,000	50,000
Common Stock, shares issued (in shares)	26,422	26,272
Treasury stock, Common Stock shares (in shares)	7,749	7,760
Convertible Class A [Member]
Stockholders' equity
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common Stock, shares authorized (in shares)	15,000	15,000
Common Stock, shares issued (in shares)	3,798	3,854
Treasury stock, Common Stock shares (in shares)	522	522