Debt (Narrative) (Details) (USD $)	6 Months Ended										6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Warehouse Facilities [Member] loan	Jun. 30, 2013 Revolving Secured Line Of Credit [Member]	Jun. 30, 2013 Warehouse Facility II [Member]		Jun. 30, 2013 Warehouse Facility III [Member]		Jun. 30, 2013 Warehouse Facility IV [Member]		Jun. 30, 2013 Warehouse Facility III And IV [Member]	Jun. 30, 2013 Senior Notes [Member]		Mar. 31, 2011 $100.0 Million Senior Notes [Member]	Jun. 30, 2013 $100.0 Million Senior Notes [Member]	Mar. 03, 2011 $100.0 Million Senior Notes [Member]	Mar. 31, 2010 $250.0 Million Senior Notes [Member]	Jun. 30, 2013 $250.0 Million Senior Notes [Member]	Feb. 01, 2010 $250.0 Million Senior Notes [Member]	Jun. 30, 2013 LIBOR [Member] Revolving Secured Line Of Credit [Member]	Jun. 30, 2013 LIBOR [Member] Warehouse Facility II [Member]		Jun. 30, 2013 LIBOR [Member] Warehouse Facility III [Member]		Jun. 30, 2013 LIBOR [Member] Warehouse Facility IV [Member]		Jun. 30, 2013 Prime Rate [Member] Revolving Secured Line Of Credit [Member]	Dec. 31, 2012 6.75% Cap Interest Rate [Member] Warehouse Facility II [Member]		Jun. 30, 2013 6.75% Cap Interest Rate [Member] Warehouse Facility III [Member]		Dec. 31, 2012 6.75% Cap Interest Rate [Member] Warehouse Facility III [Member]		Jun. 30, 2013 5.00% Cap Interest Rate [Member] Warehouse Facility III [Member]		Dec. 31, 2012 5.00% Cap Interest Rate [Member] Warehouse Facility III [Member]		Jun. 30, 2013 5.5% Cap Interest Rate [Member] Warehouse Facility II [Member]		Jun. 30, 2013 5.5% Cap Interest Rate [Member] Warehouse Facility IV [Member]		Dec. 31, 2012 5.5% Cap Interest Rate [Member] Warehouse Facility IV [Member]		Jun. 30, 2013 Original Terms Of Debt [Member] Warehouse Facility IV [Member]	Jun. 30, 2013 Extended Debt Facility [Member] Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Line of credit facility			$ 235,000,000
Maturity Date	Sep. 10, 2017		Jun. 23, 2016
Debt financing amount		475,000,000		325,000,000	[1]	75,000,000	[1]	75,000,000	[1]	75,000,000	350,000,000	[2]		100,000,000	100,000,000		250,000,000	250,000,000									325,000,000		75,000,000		75,000,000		75,000,000		75,000,000		325,000,000		75,000,000		75,000,000
Percentage of net book value of loans		80.00%	80.00%
Maximum hedging reserve	1,000,000
Number of warehouse facilities		3
Cap Interest Rate																											6.75%	[3]	6.75%	[3]	6.75%	[3]	5.00%	[3]	5.00%	[3]	5.50%	[3]	5.50%	[3]	5.50%	[3]
Percentage of collections on contributed loans	6.00%
Senior notes stated interest rate											9.125%
Debt maturity date				Dec. 27, 2015	[1],[4]	Sep. 10, 2015	[1],[5]	Apr. 05, 2016	[1],[4]		Feb. 01, 2017	[2]
Close date, secured financings				Dec. 27, 2012	[1]	Jun. 29, 2012	[1]	Apr. 05, 2013	[1]					Mar. 03, 2011			Feb. 01, 2010
Percentage of price for senior notes issued															106.00%			97.495%
Gross proceeds													106,000,000			243,700,000
Senior notes yield to maturity															7.83%			9.625%
Debt covenants	$ 1
Basis spread on variable rate																			1.875%	2.00%	[6]	1.60%	[6]	2.25%	[6]	0.875%																	2.75%	2.25%
Monthly servicing fee per financing	6.00%

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

[2] The close dates associated with the issuance of $250.0 million and $100.0 million of the Senior Notes were on February 1, 2010 and March 3, 2011, respectively.

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

[4] Represents the revolving maturity date.  The outstanding balance will amortize after the maturity date based on the cash flows of the pledged assets.

[5] Represents the revolving maturity date.  The outstanding balance will amortize after the revolving maturity date and any amounts remaining on September 10, 2017 will be due.

[6] Interest rate cap agreements are in place to limit the exposure to increasing interest rates.