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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 (loss) 29,106         29,106
Foreign currency translation (48)       (48)  
Unrealized gain (loss) on investments (839)       (839)  
Treasury stock purchased (17,309)   $ (17,309)      
Treasury stock purchased, shares     (1,284,000)      
Share-based compensation expense 3,212     3,212    
Common stock issued (274) $ 2 $ (687) 411    
Common stock issued, shares   256,000 (62,000)      
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)      
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 (loss) $ 30,753         30,753
Foreign currency translation (129)       (129)  
Unrealized gain (loss) on investments (221)       (221)  
Share-based compensation expense 3,753     3,753    
Common stock issued (1,718) $ 5 $ (2,032) 309    
Common stock issued, shares   530,000 (160,000)      
BALANCE at Mar. 31, 2021 $ 588,345 $ 878 $ (248,120) $ 662,485 $ 14 $ 173,088
BALANCE, shares at Mar. 31, 2021 87,795,103 87,795,000        
BALANCE, shares at Mar. 31, 2021 (17,362,535)   (17,363,000)