Income Taxes	9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract]
Income Taxes	10. Income Taxes To calculate its interim tax provision, at the end of each interim period the Company estimates the annual effective tax rate and applies that to its ordinary quarterly earnings. In addition, the effect of changes in enacted tax laws or rates or tax status is recognized in the interim period in which the change occurs. The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in foreign jurisdictions, permanent and temporary differences between book and tax amounts, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained or as the tax environment changes. The Company recognizes interest and penalties related to uncertain tax positions as a component of the income tax provision. The Company's unrecognized tax benefits decreased $0.8 million during the three months ended September 30, 2011. The decrease in unrecognized tax benefits during the three months ended September 30, 2011 was primarily related to an income tax settlement with the French authorities of approximately $0.8 million, offset by an increase related to federal and state research credits. The unrecognized tax benefits at September 30, 2011 were $4.0 million. With the facts and circumstances currently available to the Company, it is reasonably possible that there will be no change in the Company's unrecognized tax benefits within the next 12 months. The income tax benefit consists primarily of income tax benefits related to the French income tax settlement and acquired Scient'x operations offset by state income taxes and the tax effect of changes in deferred tax liabilities associated with tax deductible goodwill. The Company is not currently under examination by the IRS or U.S. state and local authorities.

Income Taxes

9 Months Ended

Sep. 30, 2011

10. Income Taxes

To calculate its interim tax provision, at the end of each interim period the Company estimates the annual effective tax rate and applies that to its ordinary quarterly earnings. In addition, the effect of changes in enacted tax laws or rates or tax status is recognized in the interim period in which the change occurs. The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in foreign jurisdictions, permanent and temporary differences between book and tax amounts, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained or as the tax environment changes.

The Company recognizes interest and penalties related to uncertain tax positions as a component of the income tax provision. The Company's unrecognized tax benefits decreased $0.8 million during the three months ended September 30, 2011. The decrease in unrecognized tax benefits during the three months ended September 30, 2011 was primarily related to an income tax settlement with the French authorities of approximately $0.8 million, offset by an increase related to federal and state research credits. The unrecognized tax benefits at September 30, 2011 were $4.0 million. With the facts and circumstances currently available to the Company, it is reasonably possible that there will be no change in the Company's unrecognized tax benefits within the next 12 months.

The income tax benefit consists primarily of income tax benefits related to the French income tax settlement and acquired Scient'x operations offset by state income taxes and the tax effect of changes in deferred tax liabilities associated with tax deductible goodwill.

The Company is not currently under examination by the IRS or U.S. state and local authorities.