Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The first quarter of 2021 tax rate of 1.9% reflects a projected tax benefit from current operations substantially offset with discrete tax expenses impacting the quarter. The 2021 tax benefit reflects pre-tax losses that are generating a tax benefit at the 21% federal tax rate plus research and development tax credits. These tax benefits were offset by discrete tax expenses recorded in the first quarter of 2021 related to adjustments to the valuation allowance and CARES Act tax carryback benefits recorded in 2020. The 2020 tax rate includes tax benefits from the CARES Act enacted on March 27, 2020 that included a five-year net operating loss carryback provision which enabled us to benefit certain 2020 losses and re-measure certain deferred tax assets and liabilities at the former federal tax rate of 35%. The 2020 tax rate also includes research and development tax credits and excess tax benefits related to share-based payments. As of March 31, 2021 and December 31, 2020, the Company had recorded valuation allowances of $3,192 and $3,094 primarily for certain federal deferred tax assets, state net operating loss carryforwards, and state tax credits. To measure the valuation allowance, the Company estimated in what year each of its deferred tax assets and liabilities would reverse using systematic and logical methods to estimate the reversal patterns. Based on these methods, deferred tax liabilities were assumed to reverse and generate taxable income over the next 5 to 10 years while deferred tax assets related to pension and other postretirement benefit obligations were assumed to reverse and generate tax deductions over the next 15 to 20 years. The valuation allowance primarily resulted from not having sufficient income from deferred tax liability reversals in the appropriate future periods to support the realization of certain deferred tax assets. As of March 31, 2021, based on the estimated reversal patterns of the Company’s deferred tax assets and liabilities, it is more likely than not that the Company will realize the federal deferred tax assets generated in 2021 as there is sufficient projected income from reversals of deferred tax liabilities in the next five years. Federal income tax audits have been settled for all years prior to 2018. The Internal Revenue Service (IRS) began the 2018-2019 federal tax audit in the first quarter of 2021. We are also subject to examination in major state and international jurisdictions for the 2007-2019 tax years. We believe appropriate provisions for all outstanding tax issues have been made for all jurisdictions and all open years.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.