Finance Receivables (Changes In The Allowance For Finance Credit Losses On Finance Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 192,471	$ 173,343	$ 147,178
Provision for credit losses	106,870	132,444	136,617
Charge-offs	(154,441)	(160,972)	(148,566)
Recoveries	44,985	47,656	41,405
Other			(3,291)
Balance, end of period	189,885	192,471	173,343
Retail
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	186,254	166,810	139,320
Provision for credit losses	105,292	132,760	137,942
Charge-offs	(154,433)	(160,972)	(148,566)
Recoveries	44,985	47,656	41,405
Other			(3,291)
Balance, end of period	182,098	186,254	166,810
Wholesale
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	6,217	6,533	7,858
Provision for credit losses	1,578	(316)	(1,325)
Charge-offs	(8)	0	0
Recoveries	0	0	0
Other			0
Balance, end of period	$ 7,787	$ 6,217	$ 6,533