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Consolidated Statement of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss), net of taxes
Treasury Stock
Beginning balance at Dec. 31, 2016         $ (319)  
Comprehensive income:            
Net income for the period $ 22,017          
Unrealized loss on available-for-sale marketable securities, net of taxes 479          
Total comprehensive (loss) income 22,496          
Ending balance at Mar. 31, 2017         160  
Balance (in shares) at Dec. 31, 2017   74,960        
Beginning balance at Dec. 31, 2017 399,952 $ 750 $ 244,363 $ 163,860 837 $ (9,858)
Comprehensive income:            
Net income for the period 72     72    
Unrealized loss on available-for-sale marketable securities, net of taxes (1,138)       (1,138)  
Total comprehensive (loss) income (1,066)          
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares)   205        
Exercise of stock options and other stock-based compensation, net of shares tendered for payment 4,710 $ 2 4,708      
Share-based compensation expense — stock options, restricted stock 1,408   1,408      
Treasury shares issued for Deferred Compensation Plan funding and redemptions 480   514     (34)
Shares issued pursuant to Employee Stock Plan 2,820   2,474     346
Dividends paid and accrued (14,189)     (14,189)    
Shares issued pursuant to Dividend Reinvestment Plan 24   20     4
Other (in shares)   4        
Other 205   205      
Balance (in shares) at Mar. 31, 2018   75,169        
Ending balance at Mar. 31, 2018 $ 394,344 $ 752 $ 253,692 $ 149,743 $ (301) $ (9,542)