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Income Taxes (Notes)
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block] Income TaxesThe Company recorded an effective tax rate of 20.8 percent and 74.7 percent for the three months ended March 31, 2021 and 2020, respectively. The effective tax rate for the three months ended March 31, 2021 differed from the statutory Federal income tax rate of 21.0 percent primarily due to state income taxes; the impact of ASU 2016-09 related to share-based payments; and reserve for uncertain tax positions. The effective tax rate for the three months ended March 31, 2020 was primarily due to the tax accounting impact of the CARES Act which includes a $39.6 million discrete federal income tax benefit related to the full utilization of 2018 and 2019 net operating losses against taxable income in earlier years in which 35.0 percent was the enacted tax rate; the ability to carryback the 2020 net operating loss at a 35.0 percent rate applicable in earlier years; a deferred tax remeasurement related to the 2020 tax year; and state taxes. While the Company expects its effective tax rate to be fairly consistent in the near term, it will vary depending on recurring items such as the amount of income earned in each state and the state tax rate applicable to such income. Discrete items during interim periods may also affect the Company's tax rates.