Subsequent Events (Narrative) (Details) - Red Iron Acceptance, LLC - USD ($)		12 Months Ended
	Dec. 20, 2019	Oct. 31, 2019
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facility		$ 550,000,000
Period of unlimited automatic extensions after the initial term of joint venture		2 years
Period of notice to be given by parties under joint venture for not extending initial term of joint venture		1 year
Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity under credit facility	$ 625,000,000
Period of unlimited automatic extensions after the initial term of joint venture	2 years
Period of notice to be given by parties under joint venture for not extending initial term of joint venture	1 year
Period of review for products acquired in future acquisitions to asses potential benefits and detriments	2 years
Period of pro-rata payback after initial term of joint venture	5 years