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Income tax provision (Tables) | 6 Months Ended
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Jun. 30, 2021
Income Tax Disclosure [Abstract] |
Effective income tax rate reconciliation | The effective tax rate on pretax income (loss) reconciles to the U.S. federal statutory tax rate as follows:
|  | Six Months Ended June 30, 2021 |  | Year Ended December 31, 2020(1)
Income tax at federal statutory rate |  | 21.0 | % |  | 21.0 | %
Goodwill impairment charges (Note 8) |  | — |  |  | 46.8 | %
Non-deductible acquisition costs |  | 3.7 | % |  | — |
State income tax expense, net of federal income tax benefit |  | 3.6 | % |  | 2.1 | %
Non-deductible executive compensation |  | 1.5 | % |  | 2.2 | %
Tax impact of share-based compensation |  | 1.2 | % |  | 8.5 | %
Foreign tax rate differences |  | 0.9 | % |  | 4.3 | %
Change in unrecognized tax benefits, including interest and penalties |  | 0.4 | % |  | (3.3 | %)
Research and development tax credit |  | (0.9 | %) |  | (3.7 | %)
Payables and receivables for prior year tax returns |  | (0.6 | %) |  | 3.2 | %
Non-taxable income from employee life insurance policies |  | (0.3 | %) |  | (1.1 | %)
Return to provision adjustments |  | — |  |  | (2.6 | %)
Change in valuation allowances |  | — |  |  | 0.9 | %
Other |  | — |  |  | 1.8 | %
Effective tax rate |  | 30.5 | % |  | 80.1 | %

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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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