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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, 2010 69,315,000          
Comprehensive income:            
Net income for the period       17,595,000   17,595,000
Unrealized gain on available for sale marketable securities, net of taxes     375,000     375,000
Comprehensive income           17,970,000
Exercise of stock options and other share-based compensation, net of 7,000 shares tendered for payment 1,000 872,000     468,000 1,341,000
Exercise of stock options and other share-based compensation, net of 7,000 shares tendered for payment, Shares 85,000          
Tax benefit arising from stock option transactions   119,000       119,000
Share-based compensation expense - stock options   935,000       935,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions (5,000 shares)   367,000     34,000 401,000
Shares issued pursuant to Employee Stock Plans (76,000 shares)   782,000     451,000 1,233,000
Cash dividends - $.31 per common share       (20,902,000)   (20,902,000)
Shares issued pursuant to Dividend Reinvestment Plan (4,000 shares)   44,000     22,000 66,000
Balance at Jun. 30, 2011 $ 694,000 $ 103,257,000 $ 297,000 $ 127,686,000 $ (17,692,000) $ 214,242,000
Balance, Shares at Jun. 30, 2011 69,400,000