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Income tax provision | 6 Months Ended
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Jun. 30, 2021
Income Tax Disclosure [Abstract] |
Income tax provision | 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 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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