Finance Receivables, net (Changes in Estimated Future Recoveries) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance For Credit Loss, Changes In Expected Future Recoveries	$ (99,698)		$ (120,324)
Financing Receivable, Allowance For Credit Loss, Recoveries In Excess (Shortfall) Of Forecast	119,499		127,309
Changes in estimated recoveries	19,801	$ 0	6,985	$ 0
Core
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance For Credit Loss, Changes In Expected Future Recoveries	(97,910)		(118,434)
Financing Receivable, Allowance For Credit Loss, Recoveries In Excess (Shortfall) Of Forecast	119,161		123,208
Changes in estimated recoveries	21,251		4,774
Insolvency
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance For Credit Loss, Changes In Expected Future Recoveries	(1,788)		(1,890)
Financing Receivable, Allowance For Credit Loss, Recoveries In Excess (Shortfall) Of Forecast	338		4,101
Changes in estimated recoveries	$ (1,450)		$ 2,211