Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]  
Common stock, par value$ 1.25$ 1.25
Common stock, shares authorized36,000,00036,000,000
Common stock, shares issued18,496,68018,496,680
Treasury stock, shares at cost7,151,1537,029,575