Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	24,000,000	24,000,000
Common stock, shares issued	21,456,880	21,456,880	21,456,880
Common stock, shares outstanding	13,439,000	13,726,000	13,846,000
Treasury stock, shares	8,018,269	7,730,878	7,611,245
Common Stock [Member]
Common stock, shares issued		21,457,000	21,457,000	21,457,000
Common stock, shares outstanding	21,457,000	21,457,000