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Derivative And Hedging Instruments (Schedule Of Terms Of Interest Rate Cap Agreements) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Document Period End Date Dec. 31, 2020  
Interest rate swap fair value $ 0.1 $ 0.1
Warehouse Facility II [Member]    
Derivative [Line Items]    
Debt financing amount 400.0 [1] 400.0
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 205.0 $ 205.0
Cap Interest Rate 5.50% 5.50%
Warehouse Facility IV [Member]    
Derivative [Line Items]    
Debt financing amount $ 300.0 [1] $ 300.0
Derivative, Notional Amount 300.0 300.0
Warehouse Facility IV [Member] | 6.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 33.3 $ 100.0
Cap Interest Rate 6.50% 6.50%
Warehouse Facility IV [Member] | Additional 6.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 50.0 $ 150.0
Cap Interest Rate 6.50% 6.50%
Warehouse Facility IV [Member] | Second Additional 6.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 216.7 $ 50.0
Cap Interest Rate 6.50% 6.50%
Warehouse Facility V [Member]    
Derivative [Line Items]    
Debt financing amount $ 125.0 [1] $ 100.0
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 94.0  
Cap Interest Rate 5.50%  
Warehouse Facility V [Member] | 6.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount   $ 75.0
Cap Interest Rate   6.50%
Term ABS 2016-1 [Member]    
Derivative [Line Items]    
Debt financing amount $ 500.0  
Warehouse Facility VII [Member]    
Derivative [Line Items]    
Debt financing amount 150.0 [1] $ 150.0
Derivative, Notional Amount 150.0  
Warehouse Facility VII [Member] | 5.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 68.7  
Cap Interest Rate 5.50%  
Warehouse Facility VII [Member] | 5.00% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount   $ 143.8
Cap Interest Rate   5.50%
Warehouse Facility VII [Member] | Additional Five Point Five Percent Cap Interest Rate    
Derivative [Line Items]    
Derivative, Notional Amount $ 81.3  
Cap Interest Rate 5.50%  
Warehouse Facility VIII [Member]    
Derivative [Line Items]    
Debt financing amount $ 200.0 [1] $ 200.0
Warehouse Facility VIII [Member] | 5.50% Cap Interest Rate [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 200.0 $ 200.0
Cap Interest Rate 5.50% 5.50%
[1] Interest rate cap agreements are in place to limit the exposure to increasing interest rates.