Finance Receivables, net Finance Receivables, net (Initial Negative Allowance for Recoveries) (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses at acquisition	$ (125,757,689)	$ (1,052,320)	$ (2,621,358)
Writeoffs, net		1,052,320	2,621,358
Expected recoveries		164,499	437,736
Initial negative allowance for expected recoveries	$ 3,514,165	164,499	437,736
Insolvency
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses at acquisition		(69,207)	(194,079)
Writeoffs, net		69,207	194,079
Expected recoveries		19,778	59,328
Initial negative allowance for expected recoveries		19,778	59,328
Core
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses at acquisition		(983,113)	(2,427,279)
Writeoffs, net		983,113	2,427,279
Expected recoveries		144,721	378,408
Initial negative allowance for expected recoveries		$ 144,721	$ 378,408