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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings (Accumulated Deficit) [Member]
BALANCE at Dec. 31, 2019 $ 431,295 $ 860 $ (227,315) $ 639,335 $ 344 $ 18,071
BALANCE, shares at Dec. 31, 2019   85,953,000        
BALANCE, shares at Dec. 31, 2019     (15,802,000)      
Net income 57,273         57,273
Foreign currency translation 5       5  
Unrealized gain (loss) on investments 592       592  
Treasury stock purchased (17,309)   $ (17,309)      
Treasury stock purchased, shares     (1,284,000)      
Share-based compensation expense 6,503     6,503    
Common stock issued 325 $ 3 $ (689) 1,011    
Common stock issued, shares   326,000 (62,000)      
BALANCE at Jun. 30, 2020 478,684 $ 863 $ (245,313) 646,849 941 75,344
BALANCE, shares at Jun. 30, 2020   86,279,000        
BALANCE, shares at Jun. 30, 2020     (17,148,000)      
BALANCE at Mar. 31, 2020 445,143 $ 862 $ (245,311) 642,958 (543) 47,177
BALANCE, shares at Mar. 31, 2020   86,209,000        
BALANCE, shares at Mar. 31, 2020     (17,148,000)      
Net income 28,167         28,167
Foreign currency translation 53       53  
Unrealized gain (loss) on investments 1,431       1,431  
Share-based compensation expense 3,291     3,291    
Common stock issued 599 $ 1 $ (2) 600    
Common stock issued, shares   70,000        
BALANCE at Jun. 30, 2020 478,684 $ 863 $ (245,313) 646,849 941 75,344
BALANCE, shares at Jun. 30, 2020   86,279,000        
BALANCE, shares at Jun. 30, 2020     (17,148,000)      
BALANCE at Dec. 31, 2020 $ 555,907 $ 873 $ (246,088) 658,423 364 142,335
BALANCE, shares at Dec. 31, 2020 87,264,910 87,265,000        
BALANCE, shares at Dec. 31, 2020 (17,202,546)   (17,203,000)      
Net income $ 57,402         57,402
Foreign currency translation (101)       (101)  
Unrealized gain (loss) on investments (243)       (243)  
Treasury stock purchased (5,372)   $ (5,372)      
Treasury stock purchased, shares     (440,000)      
Share-based compensation expense 7,430     7,430    
Common stock issued (1,411) $ 6 $ (2,034) 617    
Common stock issued, shares   620,000 (160,000)      
BALANCE at Jun. 30, 2021 $ 613,612 $ 879 $ (253,494) 666,470 20 199,737
BALANCE, shares at Jun. 30, 2021 87,884,843 87,885,000        
BALANCE, shares at Jun. 30, 2021 (17,802,738)   (17,803,000)      
BALANCE at Mar. 31, 2021 $ 588,345 $ 878 $ (248,120) 662,485 14 173,088
BALANCE, shares at Mar. 31, 2021   87,795,000        
BALANCE, shares at Mar. 31, 2021     (17,363,000)      
Net income 26,649         26,649
Foreign currency translation 28       28  
Unrealized gain (loss) on investments (22)       (22)  
Treasury stock purchased (5,372)   $ (5,372)      
Treasury stock purchased, shares     (440,000)      
Share-based compensation expense 3,677     3,677    
Common stock issued 307 $ 1 $ (2) 308    
Common stock issued, shares   90,000        
BALANCE at Jun. 30, 2021 $ 613,612 $ 879 $ (253,494) $ 666,470 $ 20 $ 199,737
BALANCE, shares at Jun. 30, 2021 87,884,843 87,885,000        
BALANCE, shares at Jun. 30, 2021 (17,802,738)   (17,803,000)