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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Series A Nonconvertible Preferred Stock [Member]
Preferred Stock [Member]
BALANCE at Dec. 31, 2018 $ 690,506,000 $ 487,000 $ 617,334,000 $ 129,552,000 $ (16,234,000) $ (40,635,000) $ 2,000
BALANCE (in shares) at Dec. 31, 2018   48,681,524       1,361,637 200,000
Net income 111,876,000     111,876,000      
Other comprehensive income 2,115,000       2,115,000    
Cash dividend (14,142,000)     (14,142,000)      
Issuance of common stock to employees 10,490,000 $ 2,000 10,488,000        
Issuance of common stock to employees (in shares)   246,715          
Shares withheld for employee taxes (15,920,000) $ (1,000) (15,919,000)        
Shares withheld for employee taxes (in shares)   (98,782)          
Common shares repurchased $ (649,000)         $ (649,000)  
Common shares repurchased (in shares) 4,011         4,011  
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 1,426,000   1,426,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   12,424          
Issuance of common stock to employees under an ESPP 865,000   865,000        
Issuance of common stock to employees under an ESPP (in shares)   5,852          
BALANCE at Sep. 30, 2019 786,567,000 $ 488,000 614,194,000 227,286,000 (14,119,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Sep. 30, 2019   48,847,733       1,365,648 200,000
BALANCE at Jun. 30, 2019 751,033,000 $ 488,000 611,596,000 195,036,000 (14,805,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Jun. 30, 2019   48,831,512       1,365,648 200,000
Net income 36,962,000     36,962,000      
Other comprehensive income 686,000       686,000    
Cash dividend (4,712,000)     (4,712,000)      
Issuance of common stock to employees 3,533,000   3,533,000        
Issuance of common stock to employees (in shares)   20,069          
Shares withheld for employee taxes $ (1,448,000)   (1,448,000)        
Shares withheld for employee taxes (in shares)   (7,416)          
Common shares repurchased (in shares) 0            
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 242,000   242,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   2,076          
Issuance of common stock to employees under an ESPP 271,000   271,000        
Issuance of common stock to employees under an ESPP (in shares)   1,492          
BALANCE at Sep. 30, 2019 786,567,000 $ 488,000 614,194,000 227,286,000 (14,119,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Sep. 30, 2019   48,847,733       1,365,648 200,000
BALANCE at Dec. 31, 2019 811,449,000 $ 489,000 620,236,000 249,003,000 (16,997,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Dec. 31, 2019   48,852,193       1,365,648 200,000
Net income 79,470,000     79,470,000      
Other comprehensive income 2,230,000       2,230,000    
Cash dividend (21,329,000)     (21,329,000)      
Issuance of common stock to employees 19,534,000 $ 2,000 19,532,000        
Issuance of common stock to employees (in shares)   238,996          
Shares withheld for employee taxes $ (14,293,000) $ (1,000) (14,292,000)        
Shares withheld for employee taxes (in shares)   (98,882)          
Common shares repurchased (in shares) 0            
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 1,433,000   1,433,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   8,906          
Issuance of common stock to employees under an ESPP 1,142,000   1,142,000        
Issuance of common stock to employees under an ESPP (in shares)   7,702          
BALANCE at Sep. 30, 2020 879,636,000 $ 490,000 628,051,000 307,144,000 (14,767,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Sep. 30, 2020   49,008,915       1,365,648 200,000
BALANCE at Jun. 30, 2020 839,770,000 $ 490,000 621,585,000 273,758,000 (14,781,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Jun. 30, 2020   48,992,532       1,365,648 200,000
Net income 40,500,000     40,500,000      
Other comprehensive income 14,000       14,000    
Cash dividend (7,114,000)     (7,114,000)      
Issuance of common stock to employees 6,805,000 $ 1,000 6,804,000        
Issuance of common stock to employees (in shares)   19,733          
Shares withheld for employee taxes $ (1,128,000) $ (1,000) (1,127,000)        
Shares withheld for employee taxes (in shares)   (7,199)          
Common shares repurchased (in shares) 0            
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 425,000   425,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   1,614          
Issuance of common stock to employees under an ESPP 364,000   364,000        
Issuance of common stock to employees under an ESPP (in shares)   2,235          
BALANCE at Sep. 30, 2020 $ 879,636,000 $ 490,000 $ 628,051,000 $ 307,144,000 $ (14,767,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Sep. 30, 2020   49,008,915       1,365,648 200,000