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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
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 74,914,000     74,914,000      
Other comprehensive income / loss 1,429,000       1,429,000    
Cash dividend (9,430,000)     (9,430,000)      
Issuance of common stock to employees 6,957,000 $ 2,000 6,955,000        
Issuance of common stock to employees (in shares)   226,646          
Shares withheld for employee taxes (14,472,000) $ (1,000) (14,471,000)        
Shares withheld for employee taxes (in shares)   (91,366)          
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 $ 1,184,000   1,184,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   10,348          
Issuance of common stock to employees under an ESPP 594,000   594,000        
Issuance of common stock to employees under an ESPP (in shares)   4,360          
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
BALANCE at Mar. 31, 2019 716,201,000 $ 488,000 616,206,000 156,309,000 (15,520,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Mar. 31, 2019   48,760,311       1,365,648 200,000
Net income 43,440,000     43,440,000      
Other comprehensive income / loss 715,000       715,000    
Cash dividend (4,713,000)     (4,713,000)      
Issuance of common stock to employees 3,420,000 $ 1,000 3,419,000        
Issuance of common stock to employees (in shares)   119,433          
Shares withheld for employee taxes $ (8,715,000) $ (1,000) (8,714,000)        
Shares withheld for employee taxes (in shares)   (52,611)          
Common shares repurchased (in shares) 0            
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 368,000   368,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   2,590          
Issuance of common stock to employees under an ESPP 317,000   317,000        
Issuance of common stock to employees under an ESPP (in shares)   1,789          
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
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 38,970,000     38,970,000      
Other comprehensive income / loss 2,216,000       2,216,000    
Cash dividend (14,215,000)     (14,215,000)      
Issuance of common stock to employees 12,729,000 $ 1,000 12,728,000        
Issuance of common stock to employees (in shares)   219,263          
Shares withheld for employee taxes $ (13,165,000)   (13,165,000)        
Shares withheld for employee taxes (in shares)   (91,683)          
Common shares repurchased (in shares) 0            
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 1,008,000   1,008,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   7,292          
Issuance of common stock to employees under an ESPP 778,000   778,000        
Issuance of common stock to employees under an ESPP (in shares)   5,467          
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
BALANCE at Mar. 31, 2020 846,697,000 $ 489,000 621,967,000 280,060,000 (14,537,000) $ (41,284,000) $ 2,000
BALANCE (in shares) at Mar. 31, 2020   48,910,232       1,365,648 200,000
Net income 815,000     815,000      
Other comprehensive income / loss (244,000)       (244,000)    
Cash dividend (7,117,000)     (7,117,000)      
Issuance of common stock to employees 7,064,000 $ 1,000 7,063,000        
Issuance of common stock to employees (in shares)   138,780          
Shares withheld for employee taxes $ (8,349,000)   (8,349,000)        
Shares withheld for employee taxes (in shares)   (61,246)          
Common shares repurchased (in shares) 0            
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 454,000   454,000        
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 450,000   450,000        
Issuance of common stock to employees under an ESPP (in shares)   3,152          
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