Consolidated Statements of Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Dividends declared per share (in dollars per share)	$ 0.72	[1]	$ 0.72	[1]	$ 0.72	[1]
Treasury stock, shares issued (in shares)	482,144		472,917		335,924

[1] Restated