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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - 6 months ended Jun. 30, 2016 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Series A Nonconvertible Preferred Stock [Member]
Preferred Stock [Member]
BALANCE (in shares) at Dec. 31, 2015   48,132,223       1,357,863 200,000
BALANCE at Dec. 31, 2015 $ 466,765 $ 482 $ 589,885 $ (73,627) $ (9,819) $ (40,158) $ 2
Net income (loss) 23,751     23,751      
Other comprehensive income 118       118    
Exercise of common stock options (in shares)   12,500          
Exercise of common stock options 182   182        
Issuance of common stock to employees (in shares)   216,389          
Issuance of common stock to employees 6,443 $ 2 6,441        
Shares withheld for employee taxes (in shares)   (90,886)          
Shares withheld for employee taxes (4,794) $ (1) (4,793)        
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)   28,046          
Issuance of common stock to Board of Directors and Scientific Advisory Board 1,191   1,191        
Issuance of common stock to employees under an ESPP (in shares)   4,331          
Issuance of common stock to employees under an ESPP 264   264        
BALANCE (in shares) at Jun. 30, 2016   48,302,603       1,357,863 200,000
BALANCE at Jun. 30, 2016 $ 493,920 $ 483 $ 593,170 $ (49,876) $ (9,701) $ (40,158) $ 2