Income Taxes	9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes We determine our provision for income taxes for interim periods using an estimate of our annual effective rate. We record any changes to the estimated annual rate in the interim period in which the change occurs, including discrete tax items. Our effective tax rate was (153.7%) and 50.6% for the three months ended September 30, 2013 and 2012, and (72.8%) and 127.2% for the nine months ended September 30, 2013 and 2012. The change in the effective tax rate for the three months and nine months ended September 30, 2013, as compared to the same periods in 2012, was due to the recording of a valuation allowance related to United States deferred tax assets. In the third quarter of 2013, we determined that it was not more likely than not that we would generate sufficient future taxable income to utilize the US deferred tax assets. As a result, we recorded a valuation allowance of $2.2 million. Deferred tax assets relative to our foreign jurisdictions were not affected. The factors we considered in recording a full valuation allowance on our US deferred tax assets included, among other things, our recent history of losses over the last approximately three years.

Income Taxes

9 Months Ended

Sep. 30, 2013

9. Income Taxes

We determine our provision for income taxes for interim periods using an estimate of our annual effective rate. We record any changes to the estimated annual rate in the interim period in which the change occurs, including discrete tax items. Our effective tax rate was (153.7%) and 50.6% for the three months ended September 30, 2013 and 2012, and (72.8%) and 127.2% for the nine months ended September 30, 2013 and 2012. The change in the effective tax rate for the three months and nine months ended September 30, 2013, as compared to the same periods in 2012, was due to the recording of a valuation allowance related to United States deferred tax assets.

In the third quarter of 2013, we determined that it was not more likely than not that we would generate sufficient future taxable income to utilize the US deferred tax assets. As a result, we recorded a valuation allowance of $2.2 million. Deferred tax assets relative to our foreign jurisdictions were not affected.

The factors we considered in recording a full valuation allowance on our US deferred tax assets included, among other things, our recent history of losses over the last approximately three years.