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Income taxes
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income taxes

14. Income taxes

Generally, income tax provisions for interim periods are based on an estimated annual income tax rate, adjusted for discrete tax items, with any changes affecting the estimated annual effective tax rate recorded in the interim period in which the change occurs, including discrete items. Due to the impact of losses not benefited by the Company’s European manufacturing subsidiary and certain non-deductible financial statement expenses, the Company determined the estimated annual effective tax rate method would not provide a reliable estimate of the Company’s overall annual effective tax rate. As such, the Company has calculated the tax provision using the actual effective rate for the three and six months ended June 30, 2021.

For the three months ended June 30, 2021 and 2020, the effective tax rate was 48.2% and (9.5%), respectively. For the six months ended June 30, 2021 and 2020, the effective tax rate was (150.6%) and 164.7%. The primary factors affecting the Company’s effective tax rate for the three months and six months ended June 30, 2021, were certain losses not benefited, the remeasurement of contingent consideration (which is predominantly not recognized for tax purposes), a favorable tax ruling related to certain previously unrecognized tax benefits, limits on the deductibility of executive compensation, and the reversal of tax benefits related to certain performance stock units forfeited in the current year.

During the first quarter, the Company received a favorable ruling related to certain previously unrecognized tax benefits, which resulted in the recognition of a net benefit of $0.3 million for the six months ended June 30, 2021. The Company believes it is reasonably possible that, in the next 12 months, the amount of unrecognized tax benefits related to the resolution of federal, state, and foreign matters could be reduced by $1.0 million to $1.5 million as audits close and statutes expire.