Finance Receivables, net (Portfolio Acquisitions) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jan. 01, 2020	Sep. 30, 2020	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face value	$ 132,511,985	$ 1,198,703	$ 4,652,507
Noncredit discount	(3,240,131)	(168,288)	(562,998)
Allowance for credit losses at acquisition	(125,757,689)	(852,815)	(3,474,173)
Purchase price	$ 3,514,165	177,600	615,336
Insolvency
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face value		91,793	366,211
Noncredit discount		(8,522)	(29,533)
Allowance for credit losses at acquisition		(64,740)	(258,819)
Purchase price		18,531	77,859
Core
Accounts, Notes, Loans and Financing Receivable [Line Items]
Face value		1,106,910	4,286,296
Noncredit discount		(159,766)	(533,465)
Allowance for credit losses at acquisition		(788,075)	(3,215,354)
Purchase price		$ 159,069	$ 537,477