Finance Receivables - Aging of Past Due Finance Receivables Including Non Accrual Status Finance Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	$ 8,286,383	$ 7,880,231	$ 7,932,154
Current
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	8,055,938	7,576,903	7,712,644
Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	230,445	303,328	219,510
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	131,960	168,790	125,625
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	47,891	67,058	44,748
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	50,594	67,480	49,137
Retail
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	6,799,510	6,818,699	6,708,103
Retail | Current
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	6,569,714	6,516,342	6,488,892
Retail | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	229,796	302,357	219,211
Retail | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	131,720	168,027	125,327
Retail | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	47,672	67,033	44,748
Retail | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	50,404	67,297	49,136
Wholesale
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	1,486,873	1,061,532	1,224,051
Wholesale | Current
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	1,486,224	1,060,561	1,223,752
Wholesale | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	649	971	299
Wholesale | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	240	763	298
Wholesale | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	219	25	0
Wholesale | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, gross	$ 190	$ 183	$ 1