Notes Receivable (Percentage Of Gross Notes Receivable Outstanding By FICO Score At Origination) (Details)		3 Months Ended	12 Months Ended
		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Percentage of gross notes receivable outstanding		100.00%	100.00%
701+ [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Percentage of gross notes receivable outstanding		59.00%	59.00%
601-700 [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Percentage of gross notes receivable outstanding		37.00%	37.00%
Less Than 601 [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Percentage of gross notes receivable outstanding		3.00%	3.00%
Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Percentage of gross notes receivable outstanding	[1]	1.00%	1.00%

[1] VOI notes receivable attributable to borrowers without a FICO score (who are primarily foreign borrowers).