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Income Taxes
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes

10. Income Taxes

During the three and nine months ended September 30, 2021, we recorded income tax expense of $2,102 and $12,241, respectively, which primarily consisted of foreign tax expense. During the three and nine months ended September 30, 2020, we recorded income tax expense of $3,659 and $5,680, respectively, which also primarily consisted of a foreign tax expense.

Tax expense reflects taxes due to the taxing authorities and the tax effects of temporary differences between the basis of assets and liabilities recognized for financial reporting and tax purposes, and net operating loss and tax credit carryforwards. The significant components of our total deferred tax liability as of September 30, 2021 and December 31, 2020 relate to the tax effects of the basis difference between the intangible assets acquired in our acquisitions for financial reporting and for tax purposes along with basis differences arising from accelerated tax depreciation of fixed assets.

In 2008, we established a full valuation allowance against our U.S. deferred tax asset. Management believes the full valuation allowance is still appropriate at both September 30, 2021 and December 31, 2020 since the facts and circumstances necessitating the allowance have not changed.