Debt (Narrative) (Details) (USD $)	9 Months Ended	6 Months Ended	9 Months Ended	15 Months Ended	9 Months Ended										6 Months Ended		9 Months Ended		15 Months Ended	6 Months Ended	9 Months Ended		15 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Revolving Secured Line Of Credit [Member]	Sep. 30, 2013 Revolving Secured Line Of Credit [Member]	Mar. 31, 2013 Revolving Secured Line Of Credit [Member]	Sep. 30, 2013 Revolving Secured Line Of Credit [Member] LIBOR [Member]	Sep. 30, 2013 Warehouse Facilities [Member] loan	Sep. 30, 2013 Warehouse Facility II [Member]		Sep. 30, 2013 Warehouse Facility II [Member] LIBOR [Member]		Sep. 30, 2013 Warehouse Facility III [Member]		Sep. 30, 2013 Warehouse Facility III [Member] LIBOR [Member]		Sep. 30, 2013 Warehouse Facility IV [Member]		Sep. 30, 2013 Warehouse Facility IV [Member]		Mar. 31, 2013 Warehouse Facility IV [Member]	Sep. 30, 2013 Warehouse Facility IV [Member] LIBOR [Member]	Sep. 30, 2013 Warehouse Facility IV [Member] LIBOR [Member]		Mar. 31, 2013 Warehouse Facility IV [Member] LIBOR [Member]	Sep. 30, 2013 Warehouse Facility III And IV [Member]	Sep. 30, 2013 Senior Notes [Member]		Mar. 03, 2011 $100.0 Million Senior Notes [Member]	Sep. 30, 2013 $100.0 Million Senior Notes [Member]	Feb. 01, 2011 $250.0 Million Senior Notes [Member]	Sep. 30, 2013 $250.0 Million Senior Notes [Member]	Feb. 01, 2010 $250.0 Million Senior Notes [Member]
Debt Instrument [Line Items]
Line of credit facility		$ 235,000,000	$ 235,000,000
Maturity date	Sep. 10, 2017	Jun. 23, 2016	Jun. 23, 2016	Jun. 22, 2015
Percentage of net book value of loans			80.00%			80.00%
Maximum hedging reserve	1,000,000
Number of warehouse facilities						3
Debt financing amount						475,000,000	325,000,000	[1]			75,000,000	[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
Debt maturity date							Dec. 27, 2015	[1],[3]			Sep. 10, 2015	[1],[4]			Apr. 05, 2016		Apr. 05, 2016	[1],[3]	Feb. 19, 2014						Feb. 01, 2017	[2]
Basis spread on variable rate					1.875%				2.00%	[1],[5]			1.60%	[1],[5]						2.25%	2.25%	[1],[5]	2.75%
Percentage of collections on contributed loans	6.00%
Monthly servicing fee per financing	6.00%
Senior notes stated interest rate																									9.125%
Close date, secured financings							Dec. 27, 2012	[1]			Aug. 16, 2013	[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

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

[4] 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.(5)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.

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