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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - 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, 2016 $ 528,468,000 $ 483,000 $ 604,364,000 $ (25,557,000) $ (10,666,000) $ (40,158,000) $ 2,000
BALANCE (in shares) at Dec. 31, 2016   48,270,990       1,357,863 200,000
Cumulative effect of recording excess tax benefits from share-based payment arrangements 26,450,000     26,450,000      
Net income 103,885,000     103,885,000      
Other comprehensive income (loss) (798,000)       (798,000)    
Cash dividend (5,652,000)     (5,652,000)      
Exercise of common stock options 38,000   38,000        
Exercise of common stock options (in shares)   2,250          
Issuance of common stock to employees 12,242,000 $ 3,000 12,239,000        
Issuance of common stock to employees (in shares)   265,233          
Shares withheld for employee taxes (9,432,000) $ (1,000) (9,431,000)        
Shares withheld for employee taxes (in shares)   (109,483)          
Issuance of common stock to Board of Directors and Scientific Advisory Board 2,909,000   2,909,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   37,314          
Issuance of common stock to employees under an ESPP 944,000   944,000        
Issuance of common stock to employees under an ESPP (in shares)   9,730          
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 (17,100,000)     (17,100,000)      
ADJUSTED BALANCE at Dec. 31, 2017 641,954,000 $ 485,000 611,063,000 82,026,000 (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 58,840,000     58,840,000      
Other comprehensive income (loss) (4,770,000)       (4,770,000)    
Cash dividend (11,314,000)     (11,314,000)      
Issuance of common stock to employees 12,139,000 $ 3,000 12,136,000        
Issuance of common stock to employees (in shares)   271,068          
Shares withheld for employee taxes (11,620,000) $ (1,000) (11,619,000)        
Shares withheld for employee taxes (in shares)   (108,113)          
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 $ 4,664,000   4,664,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   32,232          
Issuance of common stock to employees under an ESPP 1,090,000   1,090,000        
Issuance of common stock to employees under an ESPP (in shares)   10,303          
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 138,304,000     138,304,000      
Other comprehensive income (loss) (763,000)       (763,000)    
Cash dividend (18,853,000)     (18,853,000)      
Issuance of common stock to employees 15,877,000 $ 2,000 15,875,000        
Issuance of common stock to employees (in shares)   247,776          
Shares withheld for employee taxes (15,980,000)   (15,980,000)        
Shares withheld for employee taxes (in shares)   (99,099)          
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 $ 1,848,000   1,848,000        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   14,500          
Issuance of common stock to employees under an ESPP 1,159,000   1,159,000        
Issuance of common stock to employees under an ESPP (in shares)   7,492          
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