Income Taxes	9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes. Our overall effective tax rate for the three months ended September 30, 2012 was 20.0% compared to 31.7% for the corresponding period of 2011. For the nine months ended September 30, 2012, our effective tax rate was 26%, compared to 33.3% for the corresponding period of 2011. The decrease in the effective tax rate for the three and nine-month periods ended September 30, 2012,when compared to the corresponding periods of 2011, was primarily attributable to the release of reserves established pursuant to FASB Interpretation No. 48 (“FIN 48”) due to statute of limitation expirations, an increase to the Domestic Production Activity deduction, and increases to research and development credits in the U.S. and foreign jurisdictions. In addition, the effective tax rates for the two periods of 2012 were also lower due to a higher mix of earnings in our foreign jurisdictions (primarily Ireland), which are taxed at a lower rate than our U.S. operations, during the three and nine-month periods ended September 30, 2012, compared to the corresponding periods of 2011.

Income Taxes

9 Months Ended

Sep. 30, 2012

Income Taxes. Our overall effective tax rate for the three months ended September 30, 2012 was 20.0% compared to 31.7% for the corresponding period of 2011. For the nine months ended September 30, 2012, our effective tax rate was 26%, compared to 33.3% for the corresponding period of 2011. The decrease in the effective tax rate for the three and nine-month periods ended September 30, 2012,when compared to the corresponding periods of 2011, was primarily attributable to the release of reserves established pursuant to FASB Interpretation No. 48 (“FIN 48”) due to statute of limitation expirations, an increase to the Domestic Production Activity deduction, and increases to research and development credits in the U.S. and foreign jurisdictions. In addition, the effective tax rates for the two periods of 2012 were also lower due to a higher mix of earnings in our foreign jurisdictions (primarily Ireland), which are taxed at a lower rate than our U.S. operations, during the three and nine-month periods ended September 30, 2012, compared to the corresponding periods of 2011.