Notes Receivable (Percentage Of Gross Notes Receivable Outstanding By FICO Score At Origination) (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Percentage of gross notes receivable outstanding		100.00%	100.00%
700+ [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of gross notes receivable outstanding		57.00%	54.00%
600-699 [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of gross notes receivable outstanding		39.00%	41.00%
Less Than 600 [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of gross notes receivable outstanding		3.00%	3.00%
No Score [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of gross notes receivable outstanding	[1]	1.00%	2.00%

[1] VOI notes receivable without a FICO score are primarily related to foreign borrowers.