Subsequent Events (Details) (USD $)	3 Months Ended
	Jun. 30, 2013 Subsequent Event [Member]	Mar. 31, 2013 Warehouse Facility IV [Member]		Jun. 30, 2013 Warehouse Facility IV [Member] Original Terms Of Debt [Member] Subsequent Event [Member]	Jun. 30, 2013 Warehouse Facility IV [Member] Extended Debt Facility [Member] Subsequent Event [Member]	Jun. 30, 2013 ABS Term 2013-1 [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Debt maturity date		Feb. 19, 2014	[1],[2]	Feb. 19, 2014	Apr. 05, 2016
Basis spread on variable rate				2.75%	2.25%
Public offering of stock by Shareholders, Shares	1,500,000
Debt financing amount		$ 75,000,000	[1]			$ 140,300,000
Expected annual financing costs, percentage						1.80%
Debt Instrument Revolving Period						24 months

[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.