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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2019 $ 171,799 $ 75 $ 20,227 $ 2,819 $ 148,678
Beginning Balance, shares at Dec. 31, 2019   7,514      
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards 904 $ 1 903    
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares   56      
Common stock repurchased on vesting of restricted stock units and performance awards (378)   (378)    
Common stock repurchased on vesting of restricted stock units and performance awards, shares   (6)      
Share-based compensation expense 342   342    
Company repurchase of common stock (2,987) $ (1) (169)   (2,817)
Company repurchase of common stock, shares   (59)      
Cash dividends on common stock (2,262)       (2,262)
Unrealized gain (loss) on investments, net of tax (2,735)     (2,735)  
Net (loss) income (3,407)       (3,407)
Ending Balance at Mar. 31, 2020 161,276 $ 75 20,925 84 140,192
Ending Balance, shares at Mar. 31, 2020   7,505      
Beginning Balance at Dec. 31, 2019 171,799 $ 75 20,227 2,819 148,678
Beginning Balance, shares at Dec. 31, 2019   7,514      
Unrealized gain (loss) on investments, net of tax 4,830        
Net (loss) income 26,614        
Ending Balance at Sep. 30, 2020 197,312 $ 76 23,938 7,649 165,649
Ending Balance, shares at Sep. 30, 2020   7,646      
Beginning Balance at Mar. 31, 2020 161,276 $ 75 20,925 84 140,192
Beginning Balance, shares at Mar. 31, 2020   7,505      
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards 1,810 $ 1 1,809    
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares   96      
Common stock repurchased on vesting of restricted stock units and performance awards (110)   (110)    
Common stock repurchased on vesting of restricted stock units and performance awards, shares   (3)      
Share-based compensation expense 797   797    
Cash dividends on common stock (2,272)       (2,272)
Unrealized gain (loss) on investments, net of tax 6,877     6,877  
Net (loss) income 11,510       11,510
Ending Balance at Jun. 30, 2020 179,888 $ 76 23,421 6,961 149,430
Ending Balance, shares at Jun. 30, 2020   7,598      
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards 300   300    
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares   66      
Common stock repurchased on vesting of restricted stock units and performance awards (928)   (928)    
Common stock repurchased on vesting of restricted stock units and performance awards, shares   (18)      
Share-based compensation expense 1,145   1,145    
Cash dividends on common stock (2,292)       (2,292)
Unrealized gain (loss) on investments, net of tax 688     688  
Net (loss) income 18,511       18,511
Ending Balance at Sep. 30, 2020 197,312 $ 76 23,938 7,649 165,649
Ending Balance, shares at Sep. 30, 2020   7,646      
Beginning Balance at Dec. 31, 2020 198,235 $ 76 24,885 7,564 165,710
Beginning Balance, shares at Dec. 31, 2020   7,566      
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards 815   815    
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares   38      
Common stock repurchased on vesting of restricted stock units and performance awards (107)   (107)    
Common stock repurchased on vesting of restricted stock units and performance awards, shares   (1)      
Share-based compensation expense 1,060   1,060    
Company repurchase of common stock (3,436)   (170)   (3,266)
Company repurchase of common stock, shares   (49)      
Cash dividends on common stock (2,278)       (2,278)
Unrealized gain (loss) on investments, net of tax (5,250)     (5,250)  
Net (loss) income (4,554)       (4,554)
Ending Balance at Mar. 31, 2021 184,485 $ 76 26,483 2,314 155,612
Ending Balance, shares at Mar. 31, 2021   7,554      
Beginning Balance at Dec. 31, 2020 198,235 $ 76 24,885 7,564 165,710
Beginning Balance, shares at Dec. 31, 2020   7,566      
Unrealized gain (loss) on investments, net of tax (4,100)        
Net (loss) income 27,465        
Ending Balance at Sep. 30, 2021 207,633 $ 75 27,981 3,464 176,113
Ending Balance, shares at Sep. 30, 2021   7,505      
Beginning Balance at Mar. 31, 2021 184,485 $ 76 26,483 2,314 155,612
Beginning Balance, shares at Mar. 31, 2021   7,554      
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards 61   61    
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares   15      
Common stock repurchased on vesting of restricted stock units and performance awards (287)   (287)    
Common stock repurchased on vesting of restricted stock units and performance awards, shares   (4)      
Share-based compensation expense 1,335   1,335    
Company repurchase of common stock (3,142) $ (1) (155)   (2,986)
Company repurchase of common stock, shares   (42)      
Cash dividends on common stock (2,271)       (2,271)
Unrealized gain (loss) on investments, net of tax 2,151     2,151  
Net (loss) income 17,090       17,090
Ending Balance at Jun. 30, 2021 199,422 $ 75 27,437 4,465 167,445
Ending Balance, shares at Jun. 30, 2021   7,523      
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards 280 $ 1 279    
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares   51      
Common stock repurchased on vesting of restricted stock units and performance awards (1,010)   (1,010)    
Common stock repurchased on vesting of restricted stock units and performance awards, shares   (14)      
Share-based compensation expense 1,479   1,479    
Company repurchase of common stock (4,197) $ (1) (204)   (3,992)
Company repurchase of common stock, shares   (55)      
Cash dividends on common stock (2,269)       (2,269)
Unrealized gain (loss) on investments, net of tax (1,001)     (1,001)  
Net (loss) income 14,929       14,929
Ending Balance at Sep. 30, 2021 $ 207,633 $ 75 $ 27,981 $ 3,464 $ 176,113
Ending Balance, shares at Sep. 30, 2021   7,505