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Income Taxes
6 Months Ended
Jun. 30, 2020
Income Taxes  
Income Taxes

11.      Income Taxes

For the six months ended June 30, 2020, the Company recorded an income tax benefit of $3,875, which resulted in an effective tax rate of 11.9%. The effective tax rate differs from the U.S. statutory tax rate primarily due to an increase in the valuation allowance that is currently limiting the realizability of the Company’s net deferred tax assets as of June 30, 2020. Accordingly, the year to date tax benefit was limited due to unbenefited losses in the six months ended June 30, 2020. The Company calculates its provision for income taxes during its interim periods by applying the estimated annual effective tax rate for the full year ordinary income or loss to the respective reporting period’s year to date income or loss, while also adding any income tax expense or benefit related to discrete items occurring within that interim period.

For the six months ended June 30, 2019, the Company recorded an income tax benefit of $6,580, which resulted in an effective tax rate of 27.3%. The tax benefit primarily consists of $3,884 based on the estimated effective tax rate for the full year and $2,186 of windfall tax benefits generated from the vesting of restricted stock, disqualifying dispositions and exercising of nonqualified stock options during the period.