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Finance Receivables - Recorded Investment Of Retail and Wholesale Finance Receivables By Credit Quality Indicator (Details) - USD ($) $ in Thousands	Jun. 28, 2020	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable, Recorded Investment
Total	$ 7,391,006	$ 7,572,947	$ 7,789,401
Wholesale
Financing Receivable, Recorded Investment
2020	531,266
2019	286,627
2018	32,181
2017	9,135
2016	6,031
2015 & Prior	4,847
Total	870,087	1,156,519	1,239,694
Wholesale \| Non-Performing
Financing Receivable, Recorded Investment
2020	0
2019	2,376
2018	1,774
2017	107
2016	25
2015 & Prior	43
Total	4,325
Wholesale \| Doubtful
Financing Receivable, Recorded Investment
2020	579
2019	1,009
2018	188
2017	0
2016	0
2015 & Prior	0
Total	1,776	11,664	6,850
Wholesale \| Substandard
Financing Receivable, Recorded Investment
2020	944
2019	966
2018	53
2017	0
2016	0
2015 & Prior	0
Total	1,963	6,122	7,643
Wholesale \| Special Mention
Financing Receivable, Recorded Investment
2020	5,345
2019	5,281
2018	564
2017	0
2016	0
2015 & Prior	1,805
Total	12,995	16,125	12,642
Wholesale \| Medium Risk
Financing Receivable, Recorded Investment
2020	6,690
2019	3,587
2018	301
2017	63
2016	0
2015 & Prior	0
Total	10,641	16,800	6,170
Wholesale \| Low Risk
Financing Receivable, Recorded Investment
2020	517,708
2019	273,408
2018	29,301
2017	8,965
2016	6,006
2015 & Prior	2,999
Total	$ 838,387	$ 1,105,808	$ 1,206,389