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Income Taxes
3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]  
Income Taxes

3. INCOME TAXES

Our effective tax rate decreased from 37.9% in the three months ended March 31, 2016 to 20.3% in the three months ended March 31, 2017. The decrease in the effective tax rate between the two periods is primarily attributable to an 11% effective rate reduction for a provision-to-return adjustment related to the assignment of research and development expenditures to specific company engineering locations, and the effective income tax rates among the respective jurisdictions.