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Segments (Details) $ in Thousands | 3 Months Ended | 6 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 ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 segment | Dec. 31, 2020 USD ($) segment customer | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  | 0 |  |
Net sales | $ 158,160 | $ 133,761 | $ 120,043 | $ 68,190 | $ 160,298 | $ 141,869 | $ 176,356 | $ 93,187 |  | $ 480,154 | $ 571,710 | $ 524,067
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 74,892 | 108,105 | 96,443
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 19,737 | 19,212 | 19,085
Assets | 579,202 |  |  |  | 705,695 |  |  |  |  | 579,202 | 705,695 | 676,193
Capital Expenditures |  |  |  |  |  |  |  |  |  | 14,490 | 11,533 | 9,690
Capital Expenditures including adjustments to accruals and payables |  |  |  |  |  |  |  |  |  | 14,682 | 11,663 | 9,848
Interest expense, net |  |  |  |  |  |  |  |  |  | 20,238 | 16,782 | 16,943
Depreciation expense |  |  |  |  |  |  |  |  |  | 8,806 | 8,256 | 7,613
Amortization |  |  |  |  |  |  |  |  |  | 10,931 | 10,956 | 11,472
Purchase accounting |  |  |  |  |  |  |  |  |  | (2,017) | (417) | (900)
Stock-based compensation |  |  |  |  |  |  |  |  |  | 2,830 | 3,239 | 4,550
Impairment charges |  |  |  |  |  |  |  |  |  | 127,872 |  |
Debt modification expense |  |  |  |  |  |  |  |  |  | 3,542 |  |
Litigation proceeds |  |  |  |  |  |  |  |  |  |  | (200) |
Pension termination |  |  |  |  |  |  |  |  |  |  | 6,609 |
COVID-19 |  |  |  |  |  |  |  |  |  | 1,391 |  |
Other charges (3) |  |  |  |  |  |  |  |  |  | 128 | 263 | 1,006
Income (Loss) before taxes | 23,370 | $ 12,464 | $ (121,315) | $ (13,348) | 14,062 | $ 15,542 | $ 33,773 | $ (760) |  | (98,829) | 62,617 | 55,759
Reversal of earn out compensation |  |  |  |  |  |  |  |  |  | (2,017) | (417) | (900)
Dejana |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase accounting |  |  |  |  |  |  |  |  |  | 2,000 | 200 | 900
Reversal of earn out compensation |  |  |  |  |  |  |  |  |  | 2,000 | 200 | 900
Henderson |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase accounting |  |  |  |  |  |  |  |  |  | 17 | 217 |
Reversal of earn out compensation |  |  |  |  |  |  |  |  |  | 17 | 217 |
Work Truck Attachments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 252,838 | 293,630 | 275,244
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 62,532 | 80,747 | 80,396
Work Truck Solutions |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 227,316 | 278,080 | 248,823
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 12,360 | 27,358 | 16,047
Operating segment | Work Truck Attachments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 252,838 | 293,630 | 275,244
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 62,532 | 80,747 | 80,396
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 10,824 | 10,217 | 9,609
Assets | 365,210 |  |  |  | 361,876 |  |  |  |  | 365,210 | 361,876 | 348,714
Capital Expenditures |  |  |  |  |  |  |  |  |  | 13,174 | 9,417 | 6,931
Operating segment | Work Truck Solutions |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 227,316 | 278,080 | 248,823
Adjusted EBITDA |  |  |  |  |  |  |  |  |  | 12,360 | 27,358 | 16,047
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  | 8,913 | 8,995 | 9,476
Assets | $ 213,992 |  |  |  | $ 343,819 |  |  |  |  | 213,992 | 343,819 | 327,479
Capital Expenditures |  |  |  |  |  |  |  |  |  | $ 1,508 | $ 2,246 | $ 2,917

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