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10. Comprehensive Income (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Net income including noncontrolling interests$ 45,862,000$ 45,085,000$ 118,822,000$ 118,998,000
Foreign currency translation adjustments(71,400,000)85,100,00012,800,00028,800,000
Net unrealized holding gains (losses) on available-for-sale investments net of tax expense(12,100,000)1,700,0002,000,000(1,700,000)
Reclassification adjustments for gains included in net income including noncontrolling interests, net of tax expense00100,000200,000
Total comprehensive (loss) income(37,600,000)131,900,000133,700,000146,300,000
Comprehensive loss attributable to noncontrolling interests(400,000)(2,600,000)0(1,900,000)
Comprehensive (loss) income attributable to Bio-Rad(38,000,000)129,300,000133,700,000144,400,000
Net unrealized holding gains (losses) on available-for-sale investments, tax expense (benefit)(7,100,000)1,000,0001,100,000(1,000,000)
Reclassification adjustments for gains included in net income including noncontrolling interest, tax expense (benefit)$ (100,000)$ 100,000$ 0$ 200,000