Debt (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended												0 Months Ended		0 Months Ended	6 Months Ended		6 Months Ended
	Jun. 23, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Term ABS 2011-1 [Member]		Jun. 30, 2014 Revolving Secured Line of Credit [Member]	Jun. 30, 2014 Warehouse Facilities [Member] facility	Jun. 30, 2014 Warehouse Facility II [Member]		Jun. 30, 2014 Warehouse Facility III [Member]		Jun. 30, 2014 Warehouse Facility IV [Member]		Feb. 21, 2014 2017 Senior Notes [Member]	Jun. 30, 2014 2017 Senior Notes [Member]	Jan. 22, 2014 2021 Senior Notes [Member]	Jun. 30, 2014 2021 Senior Notes [Member]	Jan. 22, 2014 2021 Senior Notes [Member]	Jun. 30, 2014 Term ABS 2012-1 [Member]		Jun. 30, 2014 Term ABS 2012-2 [Member]		Jun. 30, 2014 Term ABS 2013-1 [Member]		Jun. 30, 2014 Term ABS 2013-2 [Member]		Jun. 30, 2014 Term ABS 2014-1 [Member]
Debt Instrument [Line Items]
Line of credit facility								$ 235,000,000
Line of credit maturity date				Sep. 10, 2017				Jun. 23, 2017
Percentage of net book value of loans								0.00%	80.00%
Maximum hedging reserve		1,000,000		1,000,000
Number of warehouse facilities									3
Debt facility financing amount						200,500,000.0	[1]		475,000,000	325,000,000	[1]	75,000,000	[1]	75,000,000	[1]				300,000,000	300,000,000	201,300,000.0	[1]	252,000,000	[1]	140,300,000.0	[1]	197,800,000.0	[1]	299,000,000	[1]
Percentage of collections on contributed loans				6.00%
Monthly servicing fee per financing				6.00%
Debt financing close date						Oct. 06, 2011															Mar. 29, 2012		Sep. 20, 2012		Apr. 25, 2013		Oct. 31, 2013		Apr. 16, 2014
Close date, secured financings																		Jan. 22, 2014
Debt maturity date						Sep. 16, 2013	[1],[2]			Dec. 27, 2015	[1],[2]	Sep. 10, 2015	[1],[3]	Apr. 05, 2016	[1],[2]			Feb. 15, 2021	Feb. 15, 2021		Mar. 17, 2014	[1],[2]	Sep. 15, 2014	[1],[2]	Apr. 15, 2015	[1],[2]	Oct. 15, 2015	[1],[2]	Apr. 15, 2016	[1],[2]
Senior notes stated interest rate																	9.125%			6.125%
Repayment of senior notes				350,000,000	0											350,000,000
Redemption price, percentage of principal amount redeemed																104.563%
Loss on extinguishment of debt		0	0	21,800,000	0											(21,800,000)
Repayments of other debt	3,600,000			3,800,000	100,000
Debt covenants		$ 1		$ 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.