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Inventories, Contracts in Progress and Vehicle Floor Plan Payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract]    
Raw materials $ 43,045 $ 45,382
Work-in-process 10,873 10,402
Finished goods 45,311 64,061
Contracts in progress 1,029 777
Inventories and contracts in progress $ 100,258 $ 120,622