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Consolidated Statements of Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividends declared per share (in dollars per share)	$ 0.76	$ 0.72	$ 0.72
Issuance of common stock (in shares)	168,339
Treasury stock, shares issued (in shares)	286,802	482,144	472,917
Common Stock [Member]
Issuance of common stock (in shares)	168,339

Number of new stock issued during the period.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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