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CONSOLIDATED STATEMENT 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, 2017 $ 659,054,000 $ 485,000 $ 611,063,000 $ 99,126,000 $ (11,464,000) $ (40,158,000) $ 2,000
BALANCE (in shares) at Dec. 31, 2017   48,476,034       1,357,863 200,000
ASC Topic 606 Adoption at Dec. 31, 2017 (17,894,000)     (17,894,000)      
ADJUSTED BALANCE at Dec. 31, 2017 641,160,000 $ 485,000 611,063,000 81,232,000 (11,464,000) $ (40,158,000) $ 2,000
BALANCE ADJUSTED (in shares) at Dec. 31, 2017   48,476,034       1,357,863 200,000
Net income 16,773,000     16,773,000      
Other comprehensive income 1,013,000       1,013,000    
Cash dividend (5,659,000)     (5,659,000)      
Issuance of common stock to employees 6,035,000 $ 3,000 6,032,000        
Issuance of common stock to employees (in shares)   250,979          
Shares withheld for employee taxes (11,031,000) $ (1,000) (11,030,000)        
Shares withheld for employee taxes (in shares)   (101,581)          
Common shares repurchased $ (477,000)         $ (477,000)  
Common shares repurchased (in shares) 3,774         3,774  
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 2,303,000   2,303,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   19,732          
Issuance of common stock to employees under an ESPP 564,000   564,000        
Issuance of common stock to employees under an ESPP (in shares)   5,532          
BALANCE at Jun. 30, 2018 650,681,000 $ 487,000 608,932,000 92,346,000 (10,451,000) $ (40,635,000) $ 2,000
BALANCE (in shares) at Jun. 30, 2018   48,650,696       1,361,637 200,000
BALANCE at Mar. 31, 2018 642,649,000 $ 486,000 609,404,000 84,360,000 (10,968,000) $ (40,635,000) $ 2,000
BALANCE (in shares) at Mar. 31, 2018   48,574,065       1,361,637 200,000
Net income 10,814,000     10,814,000      
Other comprehensive income 517,000       517,000    
Cash dividend (2,828,000)     (2,828,000)      
Issuance of common stock to employees 3,311,000 $ 2,000 3,309,000        
Issuance of common stock to employees (in shares)   120,068          
Shares withheld for employee taxes $ (5,199,000) $ (1,000) (5,198,000)        
Shares withheld for employee taxes (in shares)   (52,874)          
Common shares repurchased (in shares) 0            
Issuance of common stock to Board of Directors and Scientific Advisory Board $ 1,106,000   1,106,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   6,250          
Issuance of common stock to employees under an ESPP 311,000   311,000        
Issuance of common stock to employees under an ESPP (in shares)   3,187          
BALANCE at Jun. 30, 2018 650,681,000 $ 487,000 608,932,000 92,346,000 (10,451,000) $ (40,635,000) $ 2,000
BALANCE (in shares) at Jun. 30, 2018   48,650,696       1,361,637 200,000
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 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 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