Finance Receivables - Wholesale And Retail Receivables Accruing Interest And Are Past Due (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Past Due [Line Items]
Receivables past due and accruing interest	$ 33,079	$ 48,026	$ 42,336	$ 40,076	$ 40,725
United States
Financing Receivable, Past Due [Line Items]
Receivables past due and accruing interest	32,599	47,138	41,285	39,051	39,399
Canada
Financing Receivable, Past Due [Line Items]
Receivables past due and accruing interest	$ 480	$ 888	$ 1,051	$ 1,025	$ 1,326