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7. Stockholders' Equity Stockholders' Equity Shares Detail (Tables)

12 Months Ended

Dec. 31, 2018

Class of Stock [Line Items]

Schedule of Stock by Class [Table Text Block]

Changes to Bio-Rad's issued common stock shares are as follows (in thousands):

	Class A Shares			Class B Shares
Balance at January 1, 2016	24,230			5,131
B to A conversions	13			(13	)
Issuance of common stock	211			6
Balance at December 31, 2016	24,454			5,124
B to A conversions	34			(34	)
Issuance of common stock	191			18
Balance at December 31, 2017	24,679			5,108
B to A conversions	30			(30	)
Issuance of common stock	175			18
Balance at December 31, 2018	24,884			5,096

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