Annual report pursuant to Section 13 and 15(d)

Revenue Recognition (Revenue by customer and timing recognitions) (Details)

v3.20.4
Revenue Recognition (Revenue by customer and timing recognitions) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Disaggregation of Revenue [Line Items]                        
Retained Earnings $ 47,712       $ 160,748       $ 47,712 $ 160,748    
Net sales $ 158,160 $ 133,761 $ 120,043 $ 68,190 $ 160,298 $ 141,869 $ 176,356 $ 93,187 480,154 571,710 $ 524,067  
Independent dealer                        
Disaggregation of Revenue [Line Items]                        
Net sales                 367,030 421,114 409,384  
Government                        
Disaggregation of Revenue [Line Items]                        
Net sales                 62,762 72,810 52,582  
Fleet                        
Disaggregation of Revenue [Line Items]                        
Net sales                 42,590 66,306 58,500  
Other                        
Disaggregation of Revenue [Line Items]                        
Net sales                 7,772 11,480 3,601  
Point in time                        
Disaggregation of Revenue [Line Items]                        
Net sales                 402,513 465,899 429,117  
Over time                        
Disaggregation of Revenue [Line Items]                        
Net sales                 $ 77,641 105,811 94,950  
Work Truck Attachments                        
Disaggregation of Revenue [Line Items]                        
Number of revenue streams | item                 2      
Net sales                 $ 252,838 293,630 275,244  
Work Truck Attachments | Independent dealer                        
Disaggregation of Revenue [Line Items]                        
Net sales                 252,838 293,630 275,244  
Work Truck Attachments | Point in time                        
Disaggregation of Revenue [Line Items]                        
Net sales                 $ 252,838 293,630 275,244  
Work Truck Solutions                        
Disaggregation of Revenue [Line Items]                        
Number of revenue streams | item                 4      
Net sales                 $ 227,316 278,080 248,823  
Work Truck Solutions | Independent dealer                        
Disaggregation of Revenue [Line Items]                        
Net sales                 114,192 127,484 134,140  
Work Truck Solutions | Government                        
Disaggregation of Revenue [Line Items]                        
Net sales                 62,762 72,810 52,582  
Work Truck Solutions | Fleet                        
Disaggregation of Revenue [Line Items]                        
Net sales                 42,590 66,306 58,500  
Work Truck Solutions | Other                        
Disaggregation of Revenue [Line Items]                        
Net sales                 7,772 11,480 3,601  
Work Truck Solutions | Point in time                        
Disaggregation of Revenue [Line Items]                        
Net sales                 149,675 172,269 153,873  
Work Truck Solutions | Over time                        
Disaggregation of Revenue [Line Items]                        
Net sales                 77,641 105,811 94,950  
Effect of Change Higher/(Lower) | ASC 2014-09                        
Disaggregation of Revenue [Line Items]                        
Retained Earnings                       $ 377
Net sales                 542 251    
Effect of Change Higher/(Lower) | ASC 2014-09 | Work Truck Solutions | Over time                        
Disaggregation of Revenue [Line Items]                        
Net sales                 $ (542) $ 251 $ 299