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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total Bio Rad [Member]
Balance at Dec. 31, 2015 $ 2,485,029 $ 3 $ 300,408 $ (101) $ 1,802,581 $ 382,138  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 26,000       26,000    
Other comprehensive income, net of tax 35,628         35,628  
Issuance of common stock 11,280   11,280        
Stock compensation expense 19,730   19,730        
Tax benefit-exercise stock options 1,493   1,493        
Balance at Dec. 31, 2016 2,579,160 3 332,911 (101) 1,828,581 417,766  
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net 135   391   (256)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 122,249       122,249    
Other comprehensive income, net of tax 200,893         200,893  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect         (120,135) 120,135 $ 120,100
Issuance of common stock 14,604   4,490        
Stock compensation expense 23,439   23,439        
Treasury Stock, Value, Acquired, Cost Method       (2,920)      
Stock Issued During Period, Value, Treasury Stock Reissued       2,804      
Balance at Dec. 31, 2017 2,930,250 3 361,231 (217) 1,830,439 738,794  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 365,614       365,614    
Other comprehensive income, net of tax (106,495)         (106,495)  
Issuance of common stock 14,133   5,271        
Stock compensation expense 27,840   27,840        
Tax benefit-exercise stock options     0        
Treasury Stock, Value, Acquired, Cost Method       (48,912)      
Balance at Dec. 31, 2018 $ 4,020,331 $ 3 $ 394,342 $ (49,129) $ 3,722,073 $ (46,958)