Finance Receivables - Changes In Allowance For Credit Losses On Finance Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 190,872	$ 190,350	$ 189,885	$ 192,471
Provision for credit losses	26,383	18,880	60,874	48,932
Charge-offs	(35,741)	(28,947)	(80,462)	(74,028)
Recoveries	13,482	13,647	24,699	26,555
Balance, end of period	194,996	193,930	194,996	193,930
Retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	181,426	182,150	182,098	186,254
Provision for credit losses	27,555	20,652	60,387	48,721
Charge-offs	(35,741)	(28,947)	(80,462)	(74,028)
Recoveries	13,482	13,647	24,699	26,555
Balance, end of period	186,722	187,502	186,722	187,502
Wholesale
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	9,446	8,200	7,787	6,217
Provision for credit losses	(1,172)	(1,772)	487	211
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	$ 8,274	$ 6,428	$ 8,274	$ 6,428