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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net income including noncontrolling interests $ 30,944 $ 32,938
Foreign currency translation adjustments 34,369 20,788
Other post-employment benefits adjustments, net of tax 6 0
Net unrealized holding gains (losses) on available-for-sale investments net of tax expense 19,254 10,624
Reclassification adjustments for gains included in net income including noncontrolling interests, net of tax expense 4,084 141
Total other comprehensive income (loss) net of tax 57,713 31,553
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 88,657 64,491
Comprehensive loss attributable to noncontrolling interests 48 188
Comprehensive income (loss) attributable to Bio-Rad net of tax $ 88,705 $ 64,679