Income Taxes	9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective income tax rates were 5.8% and (3.4)% for the nine and three months ended September 30, 2016 and 31.5% for the same periods in the prior year. The 2016 effective tax rates are lower than the prior year due to $440 of additional tax benefits recorded in the third quarter of 2016 related to the application of a 2012 Federal Court of Claims decision that allowed the tax basis in certain assets to be increased. Also, in the third quarter of 2016 a tax benefit of $177 was recorded as a result of the settlement of the 2011-2012 federal tax audit. Additionally, the 2016 effective tax rates include the favorable impact of the permanent reinstatement of the U.S. research and development tax credit at the end of 2015. The total amount of unrecognized tax benefits decreased from $1,617 as of December 31, 2015 to $1,378 as of September 30, 2016 primarily due to the tax basis adjustment and settlement of the 2011-2012 federal tax audit, as discussed above. Federal income tax audits have been settled for all years prior to 2013. The Internal Revenue Service (IRS) will begin the 2013-2014 federal tax audit in the fourth quarter of 2016. We are also subject to examination in major state and international jurisdictions for the 2001-2015 tax years. We believe appropriate provisions for all outstanding tax issues have been made for all jurisdictions and all open years.

Income Taxes

9 Months Ended

Sep. 30, 2016

Our effective income tax rates were 5.8% and (3.4)% for the nine and three months ended September 30, 2016 and 31.5% for the same periods in the prior year. The 2016 effective tax rates are lower than the prior year due to $440 of additional tax benefits recorded in the third quarter of 2016 related to the application of a 2012 Federal Court of Claims decision that allowed the tax basis in certain assets to be increased. Also, in the third quarter of 2016 a tax benefit of $177 was recorded as a result of the settlement of the 2011-2012 federal tax audit. Additionally, the 2016 effective tax rates include the favorable impact of the permanent reinstatement of the U.S. research and development tax credit at the end of 2015.

The total amount of unrecognized tax benefits decreased from $1,617 as of December 31, 2015 to $1,378 as of September 30, 2016 primarily due to the tax basis adjustment and settlement of the 2011-2012 federal tax audit, as discussed above.

Federal income tax audits have been settled for all years prior to 2013. The Internal Revenue Service (IRS) will begin the 2013-2014 federal tax audit in the fourth quarter of 2016. We are also subject to examination in major state and international jurisdictions for the 2001-2015 tax years. We believe appropriate provisions for all outstanding tax issues have been made for all jurisdictions and all open years.