Derivative And Hedging Instruments (Schedule Of Terms Of Interest Rate Cap Agreements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Interest Rate Cap Agreements [Member]
Derivative [Line Items]
Derivative fair value	$ 0.1		$ 0.1
5.00% Cap Interest Rate [Member]
Derivative [Line Items]
Notional amount in next fiscal year	56.3
Warehouse Facility II [Member]
Derivative [Line Items]
Debt financing amount	325.0	[1]
Warehouse Facility II [Member] | 6.75% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	2011-07		2010-09
End date	2013-06		2013-06
Notional value	325.0		325.0
Cap Interest Rate	6.75%	[2]	6.75%	[2]
Debt financing amount	325.0		325.0
Warehouse Facility III [Member]
Derivative [Line Items]
Debt financing amount	75.0	[1]
Warehouse Facility III [Member] | 6.75% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	2010-09		2010-09
End date	2013-09		2013-09
Notional value	37.5		37.5
Cap Interest Rate	6.75%	[2]	6.75%	[2]
Debt financing amount	75.0		75.0
Warehouse Facility III [Member] | 5.00% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	2012-06
End date	2015-07
Notional value	18.8	[3]
Cap Interest Rate	5.00%	[2]
Debt financing amount	75.0
Warehouse Facility IV [Member]
Derivative [Line Items]
Debt financing amount	75.0	[1]
Warehouse Facility IV [Member] | 5.5% Cap Interest Rate [Member]
Derivative [Line Items]
Start date	2011-08		2011-08
End date	2015-09		2014-03
Notional value	75.0		75.0
Cap Interest Rate	5.50%	[2]	5.50%	[2]
Debt financing amount	$ 75.0		$ 75.0

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

[2] Rate excludes the spread over the LIBOR rate or the commercial paper rate, as applicable.

[3] The notional amount increases to $56.3 million in September 2013 when the original Warehouse Facility III interest rate cap for $37.5 million ends.