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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Issuance of common stock to non-employee directors, Shares	(6,840)	(7,835)	(14,562)
Exercise of stock options, Shares	(468,204)	(74,125)	(18,955)
Repurchase of common stock, shares	(1,184,200)
Dividends paid, per share	$ 0.48	$ 0.10	$ 0.00

X

- Definition

Number of shares issued during the period as a result of issuance of common stock for Director stock awards.

+ References

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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Number of share options (or share units) exercised during the current period.

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Number of shares that have been repurchased and retired during the period.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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