Debt (Narrative) (Details) (USD $)	12 Months Ended		9 Months Ended	12 Months Ended	15 Months Ended	12 Months Ended										6 Months Ended	12 Months Ended		15 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended		15 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Revolving Secured Line Of Credit [Member]	Dec. 31, 2013 Revolving Secured Line Of Credit [Member]	Mar. 31, 2013 Revolving Secured Line Of Credit [Member]	Dec. 31, 2013 Revolving Secured Line Of Credit [Member] LIBOR [Member]	Dec. 31, 2013 Warehouse Facilities [Member] loan	Dec. 31, 2013 Warehouse Facility II [Member]		Dec. 31, 2013 Warehouse Facility II [Member] LIBOR [Member]		Dec. 31, 2013 Warehouse Facility III [Member]		Dec. 31, 2013 Warehouse Facility III [Member] LIBOR [Member]		Sep. 30, 2013 Warehouse Facility IV [Member]	Dec. 31, 2013 Warehouse Facility IV [Member]		Mar. 31, 2013 Warehouse Facility IV [Member]	Dec. 31, 2013 Warehouse Facility IV [Member] LIBOR [Member]	Sep. 30, 2013 Warehouse Facility IV [Member] LIBOR [Member]	Dec. 31, 2013 Warehouse Facility IV [Member] LIBOR [Member]		Mar. 31, 2013 Warehouse Facility IV [Member] LIBOR [Member]	Dec. 31, 2013 2017 Senior Notes [Member]	Mar. 03, 2011 $100.0 Million Senior Notes [Member]	Dec. 31, 2013 $100.0 Million Senior Notes [Member]		Feb. 01, 2010 $250.0 Million Senior Notes [Member]	Dec. 31, 2013 $250.0 Million Senior Notes [Member]		Dec. 31, 2013 Mortgage Note [Member]	Dec. 31, 2009 Mortgage Note [Member]	Dec. 31, 2012 Mortgage Note [Member]	Dec. 31, 2008 Mortgage Note [Member]
Debt Instrument [Line Items]
Line of credit facility			$ 235,000,000	$ 235,000,000
Maturity date			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	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]							350,000,000	100,000,000	100,000,000		250,000,000	250,000,000
Debt maturity date								Dec. 27, 2015	[1],[2]			Sep. 10, 2015	[1],[3]			Apr. 05, 2016	Apr. 05, 2016	[1],[2]	Feb. 19, 2014						Feb. 01, 2017							Jun. 22, 2014	Jun. 09, 2009
Basis spread on variable rate						1.875%				2.00%	[1],[4]			1.60%	[1],[4]					2.00%	2.25%	2.00%	[1],[4]	2.75%
Percentage of collections on contributed loans							6.00%
Monthly servicing fee per financing	6.00%
Senior notes stated interest rate																									9.125%							5.70%			5.35%
Close date, secured financings								Dec. 02, 2013	[1]			Aug. 16, 2013	[1]				Dec. 04, 2013	[1]							Feb. 01, 2010		Mar. 03, 2011	[5]		Feb. 01, 2010	[5]
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%
Mortgage note	3,800,000	4,000,000																														3,800,000		4,000,000
Debt covenants		$ 1

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

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

[3] 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.

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

[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.