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Inventories, Contracts in Progress and Vehicle Floor Plan Payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract]    
Raw materials $ 43,219 $ 35,119
Work-in-process 11,753 10,775
Finished goods 62,686 70,602
Contracts in progress 6,600 4,338
Inventories and contracts in progress $ 124,258 $ 120,834