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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
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, 2014 $ 448,742 $ 471 $ 581,114 $ (88,305) $ (4,382) $ (40,158) $ 2
BALANCE (in shares) at Dec. 31, 2014   47,061,826       1,357,863 200,000
Net income 14,678     14,678      
Other comprehensive loss (5,437)       (5,437)    
Exercise of common stock options 2,034 $ 3 2,031        
Exercise of common stock options (in shares)   340,725          
Issuance of common stock to employees 10,047 $ 8 10,039        
Issuance of common stock to employees (in shares)   798,036          
Shares withheld for employee taxes (5,337)   (5,337)        
Shares withheld for employee taxes (in shares)   (124,961)          
Issuance of common stock to Board of Directors and Scientific Advisory Board 1,591   1,591        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   44,351          
Issuance of common stock to employees under an ESPP 447   447        
Issuance of common stock to employees under an ESPP (in shares)   12,246          
BALANCE at Dec. 31, 2015 466,765 $ 482 589,885 (73,627) (9,819) $ (40,158) $ 2
BALANCE (in shares) at Dec. 31, 2015   48,132,223       1,357,863 200,000
Net income 48,070     48,070      
Other comprehensive loss (847)       (847)    
Exercise of common stock options 185   185        
Exercise of common stock options (in shares)   12,750          
Issuance of common stock to employees 12,356 $ 2 12,354        
Issuance of common stock to employees (in shares)   165,826          
Shares withheld for employee taxes (4,871) $ (1) (4,870)        
Shares withheld for employee taxes (in shares)   (92,241)          
Cumulative effect of recording excess tax benefits from share-basedpayment arrangements 4,232   4,232        
Issuance of common stock to Board of Directors and Scientific Advisory Board 2,012   2,012        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   43,046          
Issuance of common stock to employees under an ESPP 566   566        
Issuance of common stock to employees under an ESPP (in shares)   9,386          
BALANCE at Dec. 31, 2016 528,468 $ 483 604,364 (25,557) (10,666) $ (40,158) $ 2
BALANCE (in shares) at Dec. 31, 2016   48,270,990       1,357,863 200,000
Net income 103,885     103,885      
Other comprehensive loss (798)       (798)    
Cash dividend (5,652)     (5,652)      
Exercise of common stock options $ 38   38        
Exercise of common stock options (in shares) 2,250 2,250          
Issuance of common stock to employees $ 12,242 $ 3 12,239        
Issuance of common stock to employees (in shares)   265,233          
Shares withheld for employee taxes (9,432) $ (1) (9,431)        
Shares withheld for employee taxes (in shares)   (109,483)          
Cumulative effect of recording excess tax benefits from share-basedpayment arrangements 26,450     26,450      
Issuance of common stock to Board of Directors and Scientific Advisory Board 2,909   2,909        
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   944        
Issuance of common stock to employees under an ESPP (in shares)   9,730          
BALANCE at Dec. 31, 2017 $ 659,054 $ 485 $ 611,063 $ 99,126 $ (11,464) $ (40,158) $ 2
BALANCE (in shares) at Dec. 31, 2017   48,476,034       1,357,863 200,000