Quarterly report pursuant to Section 13 or 15(d)

Notes Receivable (Percentage Of Gross Notes Receivable Outstanding By FICO Score At Origination) (Details)

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Notes Receivable (Percentage Of Gross Notes Receivable Outstanding By FICO Score At Origination) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of gross notes receivable outstanding 100.00% 100.00%
FICO Score, No Score [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of gross notes receivable outstanding 1.00% 1.00%
FICO Score, Less than 600 [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of gross notes receivable outstanding 3.00% 3.00%
FICO Score, 601 to 699 [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of gross notes receivable outstanding 38.00% 37.00%
FICO Score, Greater than 700 [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of gross notes receivable outstanding 58.00% 59.00%