Derivative And Hedging Instruments (Schedule Of Terms Of Interest Rate Cap Agreements) (Details) (USD $)	Mar. 31, 2013		Dec. 31, 2012
Derivative [Line Items]
Interest rate swap agreements outstanding	$ 100,000
Warehouse Facility II [Member]
Derivative [Line Items]
Debt financing amount	325,000,000	[1]
Warehouse Facility II [Member] | 6.75% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	07/2011		07/2011
End date	06/2013		06/2013
Notional value	325,000,000		325,000,000
Cap Interest Rate	6.75%		6.75%
Debt financing amount	325,000,000		325,000,000
Warehouse Facility III [Member]
Derivative [Line Items]
Debt financing amount	75,000,000	[1]
Warehouse Facility III [Member] | 6.75% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	09/2010		09/2010
End date	09/2013		09/2013
Notional value	37,500,000		37,500,000
Cap Interest Rate	6.75%		6.75%
Debt financing amount	75,000,000		75,000,000
Warehouse Facility III [Member] | 5.00% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	06/2012		06/2012
End date	07/2015		07/2015
Notional value	18,800,000		18,800,000
Cap Interest Rate	5.00%		5.00%
Debt financing amount	75,000,000		75,000,000
Derivative instrument notional value in third quarter of this year	56,300,000		56,300,000
Warehouse Facility IV [Member]
Derivative [Line Items]
Debt financing amount	75,000,000	[1]
Warehouse Facility IV [Member] | 5.5% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	08/2011		08/2011
End date	09/2015		09/2015
Notional value	75,000,000		75,000,000
Cap Interest Rate	5.50%		5.50%
Debt financing amount	$ 75,000,000		$ 75,000,000

[1] Financing made available only to a specified subsidiary of the Company.