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Consolidated Statements Of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive (Loss) Income, Net of Taxes
Retained Earnings
Treasury Stock
Balance (in shares) at Dec. 31, 2013   71,868        
Balance at Dec. 31, 2013 $ 285,143 $ 719 $ 168,329 $ 49 $ 127,464 $ (11,418)
Comprehensive income:            
Net income for the period 21,850       21,850  
Unrealized (loss) gain on available for sale marketable securities, net of taxes (24)     (24)    
Total comprehensive income 21,826          
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares)   534        
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 6,196 $ 5 6,191      
Tax benefit from equity compensation plans 2,626   2,626      
Share-based compensation expense — stock options and restricted stock 2,705   2,705      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 516   459     57
Shares issued pursuant to Employee Stock Plans 1,851   1,457     394
Cash dividends (49,077)       (49,077)  
Shares issued pursuant to Dividend Reinvestment Plan 110   326     (216)
Adjustment to purchase price allocation 3,934   3,934      
Shares issued pursuant to prior year acquisition (in shares)   476        
Shares issued pursuant to prior year acquisition 0 $ 5 (5)      
Balance (in shares) at Dec. 31, 2014   72,878        
Balance at Dec. 31, 2014 275,830 $ 729 186,022 25 100,237 (11,183)
Comprehensive income:            
Net income for the period 58,024       58,024  
Unrealized (loss) gain on available for sale marketable securities, net of taxes 518     518    
Total comprehensive income 58,542          
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares)   386        
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 6,251 $ 4 6,247      
Tax benefit from equity compensation plans 1,873   1,873      
Share-based compensation expense — stock options and restricted stock 3,033   3,033      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 488   418     70
Shares issued pursuant to Employee Stock Plans 1,701   1,363     338
Cash dividends (51,375)       (51,375)  
Shares issued pursuant to Dividend Reinvestment Plan 113   343     (230)
Shares issued pursuant to prior year acquisition (in shares)   529        
Shares issued pursuant to prior year acquisition 0 $ 5 (5)      
Balance (in shares) at Dec. 31, 2015   73,793        
Balance at Dec. 31, 2015 296,456 $ 738 199,294 543 106,886 (11,005)
Comprehensive income:            
Net income for the period 77,396       77,396  
Unrealized (loss) gain on available for sale marketable securities, net of taxes (862)     (862)    
Total comprehensive income 76,534          
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares)   301        
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 5,968 $ 3 5,965      
Tax benefit from equity compensation plans 2,773   2,773      
Share-based compensation expense — stock options and restricted stock 3,743   3,743      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 534   103     431
Shares issued pursuant to Employee Stock Plans 2,067   1,696     371
Cash dividends (53,342)       (53,342)  
Shares issued pursuant to Dividend Reinvestment Plan 109   91     18
Shares issued pursuant to prior year acquisition (in shares)   113        
Shares issued pursuant to prior year acquisition 4,000 $ 1 3,999      
Other (in shares)   (3)        
Other 0          
Balance (in shares) at Dec. 31, 2016   74,204        
Balance at Dec. 31, 2016 $ 338,842 $ 742 $ 217,664 $ (319) $ 130,940 $ (10,185)