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Inventories, Contracts in Progress and Vehicle Floor Plan Payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract]    
Raw materials $ 34,331 $ 35,119
Work-in-process 11,105 10,775
Finished goods 68,400 58,696
Contracts in progress 3,604 4,338
Inventories and contracts in progress $ 117,440 $ 108,928