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Commitments and Contingencies - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Commitments And Contingencies Disclosure [Line Items]    
Accrued regulatory expense $ 100,000 $ 175,200,000
Insurance proceeds received, before tax (800,000)  
Liability reserve   400,000
Minimum    
Commitments And Contingencies Disclosure [Line Items]    
Loss contingency in excess of accrual, range of possible loss 0  
Maximum    
Commitments And Contingencies Disclosure [Line Items]    
Loss contingency in excess of accrual, range of possible loss 200,000  
Unused Credit Card Lines    
Commitments And Contingencies Disclosure [Line Items]    
Remaining credit available 287,300,000 225,000,000.0
Marketing and Advertising Expense    
Commitments And Contingencies Disclosure [Line Items]    
Non-cancelable commitments 12,300,000  
Non-cancelable commitments due in 2021 9,200,000  
Non-cancelable commitments due in 2022 1,900,000  
Non-cancelable commitments due in 2023 600,000  
Non-cancelable commitments due in 2024 300,000  
Non-cancelable commitments due in 2025 300,000  
Federal Trade Commission Inquiry    
Commitments And Contingencies Disclosure [Line Items]    
Accrued regulatory expense 179,300,000  
Accrued professional fees $ 4,300,000  
Litigation settlement, amount awarded to other party   $ 175,000,000.0