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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2017 $ 88,834 $ 73 $ 12,311 $ (1,430) $ 77,880
Beginning Balance, shares at Dec. 31, 2017   7,301      
Common stock issued on exercise of options and vesting of restricted stock units 577 $ 1 576    
Common stock issued on exercise of options and vesting of restricted stock units, shares   126      
Common stock repurchased on vesting of restricted stock units/stock awards (2,952)   (2,952)    
Common stock repurchased on vesting of restricted stock units/stock awards, shares   (32)      
Share-based compensation expense 5,502   5,502    
Cash dividends on common stock (7,348)       (7,348)
Unrealized gain (loss) on investments, net of tax (3,638)     (3,638)  
Net income 38,062       38,062
Ending Balance at Dec. 31, 2018 119,037 $ 74 15,437 (5,068) 108,594
Ending Balance, shares at Dec. 31, 2018   7,395      
Common stock issued on exercise of options and vesting of restricted stock units 754 $ 1 753    
Common stock issued on exercise of options and vesting of restricted stock units, shares   157      
Common stock repurchased on vesting of restricted stock units/stock awards (3,136)   (3,136)    
Common stock repurchased on vesting of restricted stock units/stock awards, shares   (38)      
Share-based compensation expense 7,173   7,173    
Cash dividends on common stock (8,208)       (8,208)
Unrealized gain (loss) on investments, net of tax 7,887     7,887  
Net income 48,292       48,292
Ending Balance at Dec. 31, 2019 171,799 $ 75 20,227 2,819 148,678
Ending Balance, shares at Dec. 31, 2019   7,514      
Common stock issued on exercise of options and vesting of restricted stock units 3,084 $ 2 3,082    
Common stock issued on exercise of options and vesting of restricted stock units, shares   223      
Common stock repurchased on vesting of restricted stock units/stock awards (1,417)   (1,417)    
Common stock repurchased on vesting of restricted stock units/stock awards, shares   (27)      
Share-based compensation expense 3,436   3,436    
Company repurchase of common stock (8,056) $ (1) (443)   (7,612)
Company repurchase of common stock, shares   (144)      
Cash dividends on common stock (9,121)       (9,121)
Unrealized gain (loss) on investments, net of tax 4,745     4,745  
Net income 33,765       33,765
Ending Balance at Dec. 31, 2020 $ 198,235 $ 76 $ 24,885 $ 7,564 $ 165,710
Ending Balance, shares at Dec. 31, 2020   7,566