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Inventories, Contracts in Progress and Vehicle Floor Plan Payable (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract]    
Raw materials $ 35,937 $ 37,248
Work-in-process 10,979 11,633
Finished goods 71,065 17,861
Contracts in progress 2,434 2,735
Inventories and contracts in progress $ 120,415 $ 69,477