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Income tax provision (benefit) (Tables) | 3 Months Ended
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Mar. 31, 2021
Income Tax Disclosure [Abstract] |
Effective income tax rate reconciliation | The effective tax rate on pre-tax income (loss) reconciles to the U.S. federal statutory tax rate as follows:
|  | Quarter Ended March 31, 2021 |  | Year Ended December 31, 2020
Income tax at federal statutory rate |  | 21.0 | % |  | 21.0 | %
Goodwill impairment charges (Note 7) |  | — |  |  | 39.2 | %
State income tax expense, net of federal income tax benefit |  | 3.8 | % |  | 1.7 | %
Tax impact of share-based compensation |  | 2.1 | % |  | 7.4 | %
Non-deductible executive compensation |  | 0.9 | % |  | 2.0 | %
Foreign tax rate differences |  | 0.6 | % |  | 3.7 | %
Change in unrecognized tax benefits, including interest and penalties |  | 0.3 | % |  | (2.9 | %)
Payables and receivables for prior year tax returns |  | (0.9 | %) |  | 2.8 | %
Research and development tax credit |  | (0.6 | %) |  | (3.3 | %)
Return to provision adjustments |  | — |  |  | (2.3 | %)
Change in valuation allowances |  | — |  |  | 0.8 | %
Other |  | 0.2 | % |  | 0.8 | %
Effective tax rate |  | 27.4 | % |  | 70.9 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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