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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 |

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