Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Derivatives (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Derivatives (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
company
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing program      
Purchases of distributors financed $ 7,115 $ 7,578 $ 7,584
Amount owed by distributors to third party financing company 3,436 6,767  
Repossessed inventory required to be repurchased 0 0 $ 13
Inventories      
Truck Floor Plan Inventories, Net 7,711 3,939  
Inventories - bailment pool chasis $ 17,447 22,420  
Leases      
Number of companies | company 15    
Maximum      
Cash and Cash Equivalents      
Maturity period 3 months    
Interest rate swap      
Interest Rate Swap      
Derivative Liability $ (1,328) $ (1,195)  
Interest Rate Swap Effective 29 March 2018 through 31 March 2020      
Interest Rate Swap      
Derivative, Fixed Interest Rate 6.105%    
Notional amount $ 45,000    
Interest Rate Swap Effective 29 March 2018 through 31 March 2020 | London Interbank Offered Rate (LIBOR)      
Interest Rate Swap      
Derivative, Basis Spread on Variable Rate 3.00%    
Derivative, Floor Interest Rate 1.00%    
Interest Rate Swap Effective 31 December 2015 through 29 March 2018      
Interest Rate Swap      
Derivative, Fixed Interest Rate 6.916%    
Notional amount $ 90,000    
Interest Rate Swap Effective 31 December 2015 through 29 March 2018 | London Interbank Offered Rate (LIBOR)      
Interest Rate Swap      
Derivative, Basis Spread on Variable Rate 3.00%    
Derivative, Floor Interest Rate 1.00%    
Interest Rate Swap Effective 31 March 2020 through 30 June 2021      
Interest Rate Swap      
Derivative, Fixed Interest Rate 7.168%    
Notional amount $ 135,000    
Interest Rate Swap Effective 31 March 2020 through 30 June 2021 | London Interbank Offered Rate (LIBOR)      
Interest Rate Swap      
Derivative, Basis Spread on Variable Rate 3.00%    
Derivative, Floor Interest Rate 1.00%