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Income Taxes - Effective Tax Rate Differs from Statutory United States Federal Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 4.60% 26.90% 3.40%
Permanent difference for loss on Progressive FTC matter 0.00% 133.10% 0.00%
NOL Carryback under CARES Act (13.10%) 0.00% 0.00%
Other Permanent Differences (1.00%) (7.40%) (1.50%)
Deferred Tax Adjustments 1.10% 5.80% (0.40%)
Current FIN 48 Expense (0.30%) 7.20% (0.10%)
Other, net 1.70% 2.50% (2.30%)
Effective Tax Rate 14.00% 189.10% 20.10%