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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 97,213         97,213
Foreign currency translation 128       128  
Unrealized gain (loss) on investments 131       131  
Treasury stock purchased (17,862)   $ (17,862)      
Treasury stock purchased, shares     (1,320,000)      
Share-based compensation expense 9,735     9,735    
Common stock issued 1,031 $ 5 $ (894) 1,920    
Common stock issued, shares   535,000 (79,000)      
BALANCE at Sep. 30, 2020 521,671 $ 865 $ (246,071) 650,990 603 115,284
BALANCE, shares at Sep. 30, 2020   86,488,000        
BALANCE, shares at Sep. 30, 2020     (17,201,000)      
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)      
Net income 39,940         39,940
Foreign currency translation 123       123  
Unrealized gain (loss) on investments (461)       (461)  
Treasury stock purchased (553)   $ (553)      
Treasury stock purchased, shares     (36,000)      
Share-based compensation expense 3,232     3,232    
Common stock issued 706 $ 2 $ (205) 909    
Common stock issued, shares   209,000 (17,000)      
BALANCE at Sep. 30, 2020 521,671 $ 865 $ (246,071) 650,990 603 115,284
BALANCE, shares at Sep. 30, 2020   86,488,000        
BALANCE, shares at Sep. 30, 2020     (17,201,000)      
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 $ 85,171         85,171
Foreign currency translation (175)       (175)  
Unrealized gain (loss) on investments (192)       (192)  
Treasury stock purchased (5,372)   $ (5,372)      
Treasury stock purchased, shares     (440,000)      
Share-based compensation expense 11,287     11,287    
Common stock issued (1,241) $ 6 $ (2,034) 787    
Common stock issued, shares   643,000 (160,000)      
BALANCE at Sep. 30, 2021 $ 645,385 $ 879 $ (253,494) 670,497 (3) 227,506
BALANCE, shares at Sep. 30, 2021 87,908,259 87,908,000        
BALANCE, shares at Sep. 30, 2021 (17,802,738)   (17,803,000)      
BALANCE at Jun. 30, 2021 $ 613,612 $ 879 $ (253,494) 666,470 20 199,737
BALANCE, shares at Jun. 30, 2021   87,885,000        
BALANCE, shares at Jun. 30, 2021     (17,803,000)      
Net income 27,769         27,769
Foreign currency translation (74)       (74)  
Unrealized gain (loss) on investments 51       51  
Share-based compensation expense 3,857     3,857    
Common stock issued 170     170    
Common stock issued, shares   23,000        
BALANCE at Sep. 30, 2021 $ 645,385 $ 879 $ (253,494) $ 670,497 $ (3) $ 227,506
BALANCE, shares at Sep. 30, 2021 87,908,259 87,908,000        
BALANCE, shares at Sep. 30, 2021 (17,802,738)   (17,803,000)