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Consolidated Statements Of Stockholders' Equity (USD $)
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2008 $ 684,000 $ 84,193,000   $ 137,741,000 $ (20,936,000) $ 201,682,000
Balance, Shares at Dec. 31, 2008 68,385,000          
Comprehensive income:            
Net income for the year       30,342,000   30,342,000
Unrealized gain/(loss) on available for sale marketable securities, net of taxes                  
Comprehensive income           30,342,000
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 3,000 1,889,000     (12,000) 1,880,000
Exercise of stock options and other stock-based compensation, net of shares tendered for payment, Shares 344,000          
Tax benefit arising from stock option transactions   722,000       722,000
Share-based compensation expense - stock options   681,000       681,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions   328,000     26,000 354,000
Shares issued pursuant to Employee Stock Plans   351,000     426,000 777,000
Cash dividends per common share       (32,246,000)   (32,246,000)
Shares issued pursuant to Dividend Reinvestment Plan   43,000     45,000 88,000
Shares issue pursuant to acquisition   3,903,000     591,000 4,494,000
Balance at Dec. 31, 2009 687,000 92,110,000   135,837,000 (19,860,000) 208,774,000
Balance, Shares at Dec. 31, 2009 68,729,000          
Comprehensive income:            
Net income for the year       34,441,000   34,441,000
Unrealized gain/(loss) on available for sale marketable securities, net of taxes     (78,000)     (78,000)
Comprehensive income           34,363,000
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 6,000 4,167,000     617,000 4,790,000
Exercise of stock options and other stock-based compensation, net of shares tendered for payment, Shares 586,000          
Tax benefit arising from stock option transactions   1,938,000       1,938,000
Share-based compensation expense - stock options   1,015,000       1,015,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions   226,000     90,000 316,000
Shares issued pursuant to Employee Stock Plans   609,000     438,000 1,047,000
Cash dividends per common share       (39,285,000)   (39,285,000)
Shares issued pursuant to Dividend Reinvestment Plan   73,000     48,000 121,000
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 year       38,156,000   38,156,000
Unrealized gain/(loss) on available for sale marketable securities, net of taxes     421,000     421,000
Comprehensive income           38,577,000
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 2,000 349,000     2,012,000 2,363,000
Exercise of stock options and other stock-based compensation, net of shares tendered for payment, Shares 158,000          
Tax benefit arising from stock option transactions   1,222,000       1,222,000
Share-based compensation expense - stock options   1,870,000       1,870,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions   367,000     35,000 402,000
Shares issued pursuant to Employee Stock Plans   782,000     451,000 1,233,000
Cash dividends per common share       (42,228,000)   (42,228,000)
Shares issued pursuant to Dividend Reinvestment Plan   81,000     47,000 128,000
Shares issue pursuant to acquisition   918,000     162,000  
Balance at Dec. 31, 2011 $ 695,000 $ 105,727,000 $ 343,000 $ 126,921,000 $ (15,960,000) $ 217,726,000
Balance, Shares at Dec. 31, 2011 69,473,000