Income Taxes	6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective income tax rate, including discrete items, was 34.0% and 38.6% for the six months ended June 30, 2013 and 2012, respectively. The effective income tax rate is based upon estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods, including retroactive changes in tax legislation, settlements of tax audits or assessments, the resolution or identification of tax position uncertainties, and acquisitions of other companies. The discrete items include the tax effect of the reinstatement of the federal research and development credit at the beginning of 2013, which was retroactive to 2012, certain stock options and interest and penalties related to uncertain tax positions. For the six months ended June 30, 2013, the effective income tax rate was lower than the federal statutory tax rate mainly due to the composition of income in foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the United States, as well as the reinstatement of the federal research and development credit at the beginning of 2013, which was retroactive to 2012. For the six months ended June 30, 2012, the effective income tax rate was higher than the federal statutory tax rate mainly due to the effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income tax expense. During 2012, the Company corrected errors in its reported income tax expense attributable to prior fiscal periods. During the six months ended June 30, 2013, the Company concluded the review which gave rise to the corrections and recorded an additional $1.4 million of income tax expense.

Income Taxes

6 Months Ended

Jun. 30, 2013

The Company’s effective income tax rate, including discrete items, was 34.0% and 38.6% for the six months ended June 30, 2013 and 2012, respectively. The effective income tax rate is based upon estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods, including retroactive changes in tax legislation, settlements of tax audits or assessments, the resolution or identification of tax position uncertainties, and acquisitions of other companies.

The discrete items include the tax effect of the reinstatement of the federal research and development credit at the beginning of 2013, which was retroactive to 2012, certain stock options and interest and penalties related to uncertain tax positions. For the six months ended June 30, 2013, the effective income tax rate was lower than the federal statutory tax rate mainly due to the composition of income in foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the United States, as well as the reinstatement of the federal research and development credit at the beginning of 2013, which was retroactive to 2012. For the six months ended June 30, 2012, the effective income tax rate was higher than the federal statutory tax rate mainly due to the effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income tax expense.

During 2012, the Company corrected errors in its reported income tax expense attributable to prior fiscal periods. During the six months ended June 30, 2013, the Company concluded the review which gave rise to the corrections and recorded an additional $1.4 million of income tax expense.