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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Revision Of Prior Period Accounting Standards Update Adjustment [Member]
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings (Accumulated Deficit) [Member]
Retained Earnings (Accumulated Deficit) [Member]
Revision Of Prior Period Accounting Standards Update Adjustment [Member]
BALANCE at Dec. 31, 2018 $ 355,203 $ 1,035 $ 852 $ (220,700) $ 628,295 $ (298) $ (52,946) $ 1,035
BALANCE, shares at Dec. 31, 2018     85,174,000          
BALANCE, shares at Dec. 31, 2018       (15,401,000)        
Net income (loss) 24,232           24,232  
Foreign currency translation (17)         (17)    
Unrealized gain on investments 770         770    
Share-based compensation expense 2,406       2,406      
Common stock issued (2,381)   $ 5 $ (2,563) 177      
Common stock issued, shares     494,000 (157,000)        
BALANCE at Jun. 30, 2019 381,248   $ 857 $ (223,263) 630,878 455 (27,679)  
BALANCE, shares at Jun. 30, 2019     85,668,000          
BALANCE, shares at Jun. 30, 2019       (15,558,000)        
BALANCE at Mar. 31, 2019 380,322   $ 857 $ (223,232) 629,768 49 (27,120)  
BALANCE, shares at Mar. 31, 2019     85,659,000          
BALANCE, shares at Mar. 31, 2019       (15,556,000)        
Net income (loss) (559)           (559)  
Foreign currency translation 35         35    
Unrealized gain on investments 371         371    
Share-based compensation expense 1,037       1,037      
Common stock issued 42     $ (31) 73      
Common stock issued, shares     9,000 (2,000)        
BALANCE at Jun. 30, 2019 381,248   $ 857 $ (223,263) 630,878 455 (27,679)  
BALANCE, shares at Jun. 30, 2019     85,668,000          
BALANCE, shares at Jun. 30, 2019       (15,558,000)        
BALANCE at Dec. 31, 2019 $ 431,295   $ 860 $ (227,315) 639,335 344 18,071  
BALANCE, shares at Dec. 31, 2019 85,953,253   85,953,000          
BALANCE, shares at Dec. 31, 2019 (15,801,896)     (15,802,000)        
Net income (loss) $ 57,273           57,273  
Foreign currency translation 5         5    
Unrealized gain 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 86,278,765   86,279,000          
BALANCE, shares at Jun. 30, 2020 (17,148,016)     (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 (loss) 28,167           28,167  
Foreign currency translation 53         53    
Unrealized gain 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 86,278,765   86,279,000          
BALANCE, shares at Jun. 30, 2020 (17,148,016)     (17,148,000)