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Summary of Significant Accounting Policies - Derivatives (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
company
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Financing program      
Purchases of distributors financed $ 8,644 $ 8,497 $ 7,115
Amount owed by distributors to third party financing company 7,127 7,756  
Uncollectible outstanding receivables 0 0  
Repossessed inventory required to be repurchased 0 0 $ 0
Inventories      
Truck Floor Plan Inventories, Net 6,539 4,204  
Inventories - bailment pool chasis $ 28,645 $ 15,197  
Leases      
Number of companies | company 15    
Maximum      
Cash and Cash Equivalents      
Maturity period   3 months  
Interest rate swap      
Interest Rate Swap      
Derivative Liability $ (5,023) $ (1,530)  
Interest Rate Swap Effective 29 March 2018 through 31 March 2020      
Interest Rate Swap      
Derivative, Fixed Interest Rate 1.86%    
Notional amount $ 45,000    
Interest Rate Swap Effective 29 March 2018 through 31 March 2020 | London Interbank Offered Rate (LIBOR)      
Interest Rate Swap      
Derivative, Floor Interest Rate 1.00%    
Interest rate swap effective May 31,2019 through May 31,2024 [member]      
Interest Rate Swap      
Derivative, Fixed Interest Rate 2.495%    
Derivative, Floor Interest Rate 1.00%    
Interest Rate Swap Effective 31 December 2015 through 29 March 2018      
Interest Rate Swap      
Derivative, Fixed Interest Rate 2.67%    
Notional amount $ 90,000    
Interest Rate Swap Effective 31 December 2015 through 29 March 2018 | London Interbank Offered Rate (LIBOR)      
Interest Rate Swap      
Derivative, Floor Interest Rate 1.00%    
Interest Rate Swap Effective 31 March 2020 through 30 June 2021      
Interest Rate Swap      
Derivative, Fixed Interest Rate 2.918%    
Notional amount $ 135,000    
Interest Rate Swap Effective 31 March 2020 through 30 June 2021 | London Interbank Offered Rate (LIBOR)      
Interest Rate Swap      
Derivative, Floor Interest Rate 1.00%