Income Taxes	6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes. Our overall effective tax rate for the three months ended June 30, 2013 was 25.0%, compared to 30.8% for the corresponding period of 2012. For the six months ended June 30, 2013, our effective tax rate was 15.2%, compared to 29.2% for the corresponding period of 2012. The effective income tax rates for the three and six-month periods ended June 30, 2013, when compared to the corresponding periods of 2012, were lower as a result of a higher mix of earnings from our foreign operations, which are taxed at a lower rate than our U.S. operations. In addition, the effective tax rate for the six months ended June 30, 2013 was lower than the corresponding prior year period due to the reinstatement of the federal research and development credit for the 2012 tax year. The credit was reinstated by the American Taxpayer Relief Act of 2012, which was signed on January 2, 2013. We recognized the federal research and development credit as a discrete benefit in the first quarter of 2013, the period in which the reinstatement was enacted.

Income Taxes

6 Months Ended

Jun. 30, 2013

Income Taxes. Our overall effective tax rate for the three months ended June 30, 2013 was 25.0%, compared to 30.8% for the corresponding period of 2012. For the six months ended June 30, 2013, our effective tax rate was 15.2%, compared to 29.2% for the corresponding period of 2012. The effective income tax rates for the three and six-month periods ended June 30, 2013, when compared to the corresponding periods of 2012, were lower as a result of a higher mix of earnings from our foreign operations, which are taxed at a lower rate than our U.S. operations. In addition, the effective tax rate for the six months ended June 30, 2013 was lower than the corresponding prior year period due to the reinstatement of the federal research and development credit for the 2012 tax year. The credit was reinstated by the American Taxpayer Relief Act of 2012, which was signed on January 2, 2013. We recognized the federal research and development credit as a discrete benefit in the first quarter of 2013, the period in which the reinstatement was enacted.