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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, 2015         $ (9,819)    
Net income $ 23,751            
Other comprehensive income 118            
BALANCE at Jun. 30, 2016         (9,701)    
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
Cumulative effect of recording excess tax benefits from share-based payment arrangements 26,450     26,450      
Net income 57,552     57,552      
Other comprehensive income (905)       (905)    
Cash dividend (2,828)     (2,828)      
Exercise of common stock options 28   28        
Exercise of common stock options (in shares)   1,750          
Issuance of common stock to employees 5,470 $ 1 5,469        
Issuance of common stock to employees (in shares)   242,175          
Shares withheld for employee taxes (8,501)   (8,501)        
Shares withheld for employee taxes (in shares)   (101,165)          
Issuance of common stock to Board of Directors and Scientific Advisory Board 1,628   1,628        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   24,814          
Issuance of common stock to employees under an ESPP 450   450        
Issuance of common stock to employees under an ESPP (in shares)   5,928          
BALANCE at Jun. 30, 2017 $ 607,812 $ 484 $ 603,438 $ 55,617 $ (11,571) $ (40,158) $ 2
BALANCE (in shares) at Jun. 30, 2017   48,444,492       1,357,863,000 200,000