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Consolidated Statements Of Stockholders' Equity And Comprehensive Income (USD $)
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2010$ 693,000$ 100,138,000$ (78,000)$ 130,993,000$ (18,667,000)$ 213,079,000
Balance, Shares at Dec. 31, 201069,315,000     
Comprehensive income:      
Net income for the period   27,591,000 27,591,000
Unrealized gain on available for sale marketable securities, net of taxes  451,000  451,000
Comprehensive income     28,042,000
Exercise of stock options and other share-based compensation, net of 7,000 shares tendered for payment1,00081,000  1,998,0002,080,000
Exercise of stock options and other share-based compensation, net of 7,000 shares tendered for payment, Shares126,000     
Tax benefit arising from stock option transactions 1,175,000   1,175,000
Share-based compensation expense - stock options 1,402,000   1,402,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions (5,000 shares) 367,000  34,000401,000
Shares issued pursuant to Employee Stock Plans (76,000 shares) 782,000  451,0001,233,000
Cash dividends - $.47 per common share   (31,494,000) (31,494,000)
Shares issued pursuant to Dividend Reinvestment Plan (6,000 shares) 61,000  37,00098,000
Shares issued pursuant to Acquisition (27,000 shares) 918,000  162,0001,080,000
Balance at Sep. 30, 2011$ 694,000$ 104,924,000$ 373,000$ 127,090,000$ (15,985,000)$ 217,096,000
Balance, Shares at Sep. 30, 201169,441,000