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Income Taxes - Effective Tax Rate Differs from Statutory United States Federal Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Statutory Rate 21.00% 21.00% 21.00%
Increases (Decreases) in United States Federal Taxes      
State Income Taxes, Net of Federal Income Tax Benefit 3.80% 4.60% 26.90%
Permanent Difference for Loss on Progressive FTC matter 0.00% 0.00% 133.10%
NOL Carryback under CARES Act 0.00% (13.10%) 0.00%
Other Permanent Differences 0.00% (1.00%) (7.40%)
Deferred Tax Adjustments 0.00% 1.10% 5.80%
Current Uncertain Tax Position Expense 0.70% (0.30%) 7.20%
Other, Net 0.30% 1.70% 2.50%
Effective Tax Rate 25.80% 14.00% 189.10%