Income Taxes	6 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We determine the tax provision for interim periods using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a cumulative adjustment. We classify interest and penalties associated with unrecognized tax benefits as income tax expense in our Condensed Consolidated Statements of Operations. Our effective tax rate was 30.6% and 33.9% for the first six months of 2012 and 2011, respectively. This decrease was primarily due to an increase in net favorable discrete items recorded in 2012 relative to 2011, partially offset by the expiration of the research and development tax credit on December 31, 2011. During the second quarter of 2012, we increased our estimate of a tax deduction available for 2011 and recorded the related benefit as a favorable discrete item, which reduced our effective tax rate. Absent this discrete item, our effective tax rate for the second quarter of 2012 would be approximately 35%. We recorded an adjustment to our unrecognized tax benefits during the first quarter of 2012, resulting from the settlement of an ongoing tax audit, which favorably impacted our income tax provision by $12.0 million. We do not anticipate recognition of any material unrecognized tax benefits in the next twelve months. In the first quarter of 2012, we also recognized $5.6 million of tax expense as a discrete item in connection with the license of certain intellectual property rights to a wholly owned foreign subsidiary.

Income Taxes

6 Months Ended

Jun. 30, 2012

We determine the tax provision for interim periods using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that are taken into account in the relevant period. Each quarter we update our estimate of the annual effective tax rate, and if our estimated tax rate changes, we make a cumulative adjustment. We classify interest and penalties associated with unrecognized tax benefits as income tax expense in our Condensed Consolidated Statements of Operations.

Our effective tax rate was 30.6% and 33.9% for the first six months of 2012 and 2011, respectively. This decrease was primarily due to an increase in net favorable discrete items recorded in 2012 relative to 2011, partially offset by the expiration of the research and development tax credit on December 31, 2011.

During the second quarter of 2012, we increased our estimate of a tax deduction available for 2011 and recorded the related benefit as a favorable discrete item, which reduced our effective tax rate. Absent this discrete item, our effective tax rate for the second quarter of 2012 would be approximately 35%.

We recorded an adjustment to our unrecognized tax benefits during the first quarter of 2012, resulting from the settlement of an ongoing tax audit, which favorably impacted our income tax provision by $12.0 million. We do not anticipate recognition of any material unrecognized tax benefits in the next twelve months. In the first quarter of 2012, we also recognized $5.6 million of tax expense as a discrete item in connection with the license of certain intellectual property rights to a wholly owned foreign subsidiary.