|3 Months Ended|
Mar. 31, 2021
|Income Tax Disclosure [Abstract]|
|Income Tax||Income TaxOur effective tax rate may vary from the U.S. federal statutory tax rate due to the change in the mix of earnings in various state jurisdictions with different statutory rates, benefits related to tax credits, and the tax impact of non-deductible expenses, stock award activities and other permanent differences between income before income taxes and taxable income. The effective tax rate for the three months ended March 31, 2021 and 2020 was (214.1)% and 20.7%, respectively. The variance from the U.S. federal statutory tax rate of 21% for the three months ended March 31, 2021 was significantly impacted by discrete tax benefits related to net excess tax windfalls from share-based compensation resulting from increased stock option exercise activity, stock award vesting and appreciation of our stock price during the period.|
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.
Reference 1: http://www.xbrl.org/2003/role/disclosureRef