Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Stockholders' Equity (Unaudited) [Abstract]
Cash dividends - per share (in dollars per share)	$ 0.60	$ 0.60
Purchase of treasury shares (in shares)	769,568	1,458,609
Net issuance of shares for acquisition (in shares)	1,269,592
Net issuance of shares to employee benefit plans and other stock plans, including tax benefit (in shares)	85,943	59,128