CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)	Dec. 31, 2010	Mar. 31, 2011 Restated
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	17,660,312	18,465,255
Stock dividend declared		790,405
Treasury stock (in shares)	2,023,838	2,023,838