Debt (Schedule Of Outstanding Debt Amount) (Details) (USD $)	Sep. 30, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Balance outstanding	$ 115,800,000		$ 43,900,000
Balance outstanding	791,850,000		599,281,000
Balance outstanding	350,307,000		350,378,000
Restricted cash and cash equivalents pledged as collateral	167,706,000		104,679,000
Revolving Secured Line Of Credit [Member]
Debt Instrument [Line Items]
Balance outstanding	115,800,000		43,900,000
Amount available for borrowing	119,200,000	[1]	161,100,000	[1]
Interest rate	2.09%		2.55%
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Balance outstanding	0		163,200,000
Amount available for borrowing	325,000,000	[1]	161,800,000	[1]
Loans pledged as collateral	0		242,119,000
Restricted cash and cash equivalents pledged as collateral	1,626,000		6,117,000
Interest rate	2.96%		2.99%
Warehouse Facility III [Member]
Debt Instrument [Line Items]
Balance outstanding	0		70,000,000
Amount available for borrowing	75,000,000	[1]	5,000,000	[1]
Loans pledged as collateral	0		91,601,000
Restricted cash and cash equivalents pledged as collateral	538,000		3,321,000
Interest rate	1.82%		1.89%
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Balance outstanding	37,600,000		37,500,000
Amount available for borrowing	37,400,000	[1]	37,500,000	[1]
Loans pledged as collateral	49,003,000		62,260,000
Restricted cash and cash equivalents pledged as collateral	2,843,000		2,188,000
Interest rate	2.97%		3.05%
Term ABS 2009-1 [Member]
Debt Instrument [Line Items]
Balance outstanding			27,581,000
Loans pledged as collateral			105,209,000
Restricted cash and cash equivalents pledged as collateral			13,526,000
Interest rate			5.68%
Term ABS 2010-1 [Member]
Debt Instrument [Line Items]
Balance outstanding	100,500,000		100,500,000
Loans pledged as collateral	123,609,000		125,541,000
Restricted cash and cash equivalents pledged as collateral	14,288,000		14,116,000
Interest rate	2.36%		2.36%
Term ABS 2011-1 [Member]
Debt Instrument [Line Items]
Balance outstanding	200,500,000		200,500,000
Loans pledged as collateral	244,531,000		248,167,000
Restricted cash and cash equivalents pledged as collateral	25,300,000		23,268,000
Interest rate	2.90%		2.90%
Term ABS 2012-1 [Member]
Debt Instrument [Line Items]
Balance outstanding	201,250,000
Loans pledged as collateral	246,756,000
Restricted cash and cash equivalents pledged as collateral	23,561,000
Interest rate	2.38%
Term ABS 2012-2 [Member]
Debt Instrument [Line Items]
Balance outstanding	252,000,000	[2]
Loans pledged as collateral	312,152,000
Restricted cash and cash equivalents pledged as collateral	51,103,000
Interest rate	1.63%
Senior Notes [Member]
Debt Instrument [Line Items]
Balance outstanding	350,307,000		350,378,000
Interest rate	9.13%		9.13%
Unamortized debt premium net	$ 300,000		$ 400,000

[1] Availability may be limited by the amount of assets pledged as collateral.

[2] As of September 30, 2012 and December 31, 2011, the outstanding balance presented for the Senior Notes includes a net unamortized debt premium of $0.3 million and $0.4 million, respectively.