Finance Receivables, net (Changes in Estimated Future Recoveries) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance For Credit Loss, Changes In Expected Future Recoveries	$ (63,587)		$ (183,911)
Financing Receivable, Allowance For Credit Loss, Recoveries In Excess (Shortfall) Of Forecast	88,990		216,299
Changes in estimated recoveries	25,403	$ 0	32,388	$ 0
Core
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance For Credit Loss, Changes In Expected Future Recoveries	(62,999)		(181,433)
Financing Receivable, Allowance For Credit Loss, Recoveries In Excess (Shortfall) Of Forecast	86,743		209,951
Changes in estimated recoveries	23,744		28,518
Insolvency
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance For Credit Loss, Changes In Expected Future Recoveries	(588)		(2,478)
Financing Receivable, Allowance For Credit Loss, Recoveries In Excess (Shortfall) Of Forecast	2,247		6,348
Changes in estimated recoveries	$ 1,659		$ 3,870