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Inventories, Contracts in Progress and Vehicle Floor Plan Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventories, Contracts in Progress And Vehicle Floor Plan Payable [Abstract]    
Raw materials $ 35,119 $ 37,248
Work-in-process 10,775 11,633
Finished goods 58,696 17,861
Contracts in Progress 4,338 2,735
Inventories and contracts in progress $ 108,928 $ 69,477