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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income, net of taxes
Retained Earnings
Treasury Stock
Balance at Dec. 31, 2014       $ 25    
Comprehensive income:            
Net income for the period $ 15,516          
Unrealized gain on available for sale marketable securities, net of taxes 3          
Total comprehensive income 15,519          
Balance at Mar. 31, 2015       28    
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 18,626       18,626  
Unrealized gain on available for sale marketable securities, net of taxes 555     555    
Total comprehensive income 19,181          
Exercise of stock options and other stock-based compensation, net of shares tendered (in shares)   131        
Exercise of stock options and other stock-based compensation, net of shares tendered 2,534 $ 1 2,533      
Tax benefit from equity compensation plans 300   300      
Share-based compensation expense — stock options and restricted stock 1,013   1,013      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 534   525     9
Shares issued pursuant to Employee Stock Purchase Plan 2,067   1,696     371
Cash dividends (13,158)       (13,158)  
Shares issued pursuant to Dividend Reinvestment Plan 28   90     (62)
Shares issued pursuant to settlement (in shares)   113        
Shares issued pursuant to settlement 4,000 $ 1 3,999      
Balance (in shares) at Mar. 31, 2016   74,037        
Balance at Mar. 31, 2016 $ 312,955 $ 740 $ 209,450 $ 1,098 $ 112,354 $ (10,687)