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Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $) | 9 Months Ended
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Sep. 30, 2012
Unrealized loss on available for sale marketable securities, taxes | $ 118,000
Stock tendered during period shares for redemption of stock options, shares | 13,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions, shares | 10,000
Cash dividends per common share | $ 0.49
Shares issued pursuant to Dividend Reinvestment Plan, shares | 4,000
Shares issued pursuant to acquisition, shares | 396,000

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