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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Common stock, par value	$ 0.001	$ 0.001
Options exercised, shares	136,290	51,850
Conversion of common stock units, shares	15,715	160,876
Conversion of restricted stock units, shares	170,876	46,584
Cash dividends, per share	$ 0.33	$ 0.24
Treasury stock, beginning balance, shares	21,813,196	21,813,196
Treasury stock, acquisition of shares	60,126	0
Treasury stock, ending balance, shares	21,873,322	21,813,196

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Shares of stock issued during the period as a result of the conversion of common stock units which represented deferred compensation of directors and/or employees.

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

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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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

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