Loans Receivable (Schedule Of Consumer Loans Forecasted Collection Percentage) (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Period End Date		Dec. 31, 2019
Loans Originating in 2010 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	77.80%	77.70%	77.60%
Initial Forecasted Collection Percentage	[1]										73.60%
Current Forecast Variance	[1]		0.10%	0.20%
Current Forecast Variance From Initial Forecast	[1]										4.20%
Loans Originating in 2011 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	74.80%	74.70%	74.70%
Initial Forecasted Collection Percentage	[1]									72.50%
Current Forecast Variance	[1]		0.10%	0.10%
Current Forecast Variance From Initial Forecast	[1]									2.30%
Loans Originating in 2012 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	73.90%	73.80%	73.80%
Initial Forecasted Collection Percentage	[1]								71.40%
Current Forecast Variance	[1]		0.10%	0.10%
Current Forecast Variance From Initial Forecast	[1]								2.50%
Loans Originating in 2013 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	73.50%	73.50%	73.50%
Initial Forecasted Collection Percentage	[1]							72.00%
Current Forecast Variance	[1]		0.00%	0.00%
Current Forecast Variance From Initial Forecast	[1]							1.50%
Loans Originating in 2014 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	71.70%	71.70%	71.70%
Initial Forecasted Collection Percentage	[1]						71.80%
Current Forecast Variance	[1]		0.00%	0.00%
Current Forecast Variance From Initial Forecast	[1]						(0.10%)
Loans Originating in 2015 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	65.40%	65.40%	65.50%
Initial Forecasted Collection Percentage	[1]					67.70%
Current Forecast Variance	[1]		0.00%	(0.10%)
Current Forecast Variance From Initial Forecast	[1]					(2.30%)
Loans Originating in 2016 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	64.10%	64.20%	64.80%
Initial Forecasted Collection Percentage	[1]				65.40%
Current Forecast Variance	[1]		(0.10%)	(0.70%)
Current Forecast Variance From Initial Forecast	[1]				(1.30%)
Loans Originating in 2017 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	64.80%	65.50%	65.60%
Initial Forecasted Collection Percentage	[1]			64.00%
Current Forecast Variance	[1]		(0.70%)	(0.80%)
Current Forecast Variance From Initial Forecast	[1]			0.80%
Loans Originating in 2018 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	65.10%	65.00%
Initial Forecasted Collection Percentage	[1]	64.00%	63.60%
Current Forecast Variance	[1]		0.10%
Current Forecast Variance From Initial Forecast	[1]	0.60%	1.50%
Loans Originating in 2019 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Collection Percentage	[1]	64.60%

[1] Represents the total forecasted collections we expect to collect on the Consumer Loans as a percentage of the repayments that we were contractually owed on the Consumer Loans at the time of assignment.  Contractual repayments include both principal and interest. Forecasted collection rates are negatively impacted by canceled Consumer Loans as the contractual amount owed is not removed from the denominator for purposes of computing forecasted collection rates in the table.