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Consolidated Statements of Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Number of acquired common stock shares		177,100	275,900
Number of converted redeemable preference shares	13	37	36
Common Stock Shares
Number of converted redeemable preference shares	13	37	36
Capital in Excess of Par Value
Number of converted redeemable preference shares	13	37	36
Treasury Stock - Common
Number of acquired common stock shares		177,100	275,900

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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