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Summary of Significant Accounting Policies - Impairment and Intangibles (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) item location segment | Dec. 31, 2020 USD ($)
Goodwill and other intangible assets |  |
Number of operating lease facilities locations | location | 2 |
Impairment charges | $ 1,211 | $ 127,872
Number of Reporting Units | item | 3 |
Number of Reportable Segments | segment | 2 |
Goodwill | $ 113,134 | 113,134
Goodwill impairment | 0 | 0
Intangible assets | 273,755 | 273,755
Gross intangible assets | 196,155 | 196,155
Accumulated amortization | 131,646 | 120,964
Dejana |  |
Goodwill and other intangible assets |  |
Indefinite-lived intangibles, estimated fair value | 17,900 |
Dejana | Trade Names |  |
Goodwill and other intangible assets |  |
Indefinite-lived intangibles, net carrying amount | 14,000 |
Distribution network |  |
Goodwill and other intangible assets |  |
Gross intangible assets | 80,000 | 80,000
Accumulated amortization | $ 71,000 | 67,000
Distribution network | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 15 years |
Distribution network | Maximum |  |
Goodwill and other intangible assets |  |
Amortization period | 20 years |
Trademark-Blizzard |  |
Goodwill and other intangible assets |  |
Gross intangible assets | $ 5,459 | 5,459
Accumulated amortization | $ 3,901 | 3,807
Trademark-Blizzard | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 7 years |
Trademark-Blizzard | Maximum |  |
Goodwill and other intangible assets |  |
Amortization period | 25 years |
Patents |  |
Goodwill and other intangible assets |  |
Gross intangible assets | $ 21,136 | 21,136
Accumulated amortization | $ 15,739 | 14,484
Patents | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 7 years |
Patents | Maximum |  |
Goodwill and other intangible assets |  |
Amortization period | 20 years |
Customer relations |  |
Goodwill and other intangible assets |  |
Gross intangible assets | $ 80,920 | 80,920
Accumulated amortization | $ 32,366 | 27,196
Customer relations | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 15 years |
Customer relations | Maximum |  |
Goodwill and other intangible assets |  |
Amortization period | 19 years 6 months |
Noncompete agreements |  |
Goodwill and other intangible assets |  |
Gross intangible assets | $ 8,640 | 8,640
Accumulated amortization | $ 8,640 | 8,477
Noncompete agreements | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 4 years |
Noncompete agreements | Maximum |  |
Goodwill and other intangible assets |  |
Amortization period | 5 years |
Municipal Reporting Unit |  |
Goodwill and other intangible assets |  |
Goodwill impairment |  | 47,799
Dejana Reporting Unit |  |
Goodwill and other intangible assets |  |
Goodwill impairment |  | 80,073
Work Truck Attachments segment |  |
Goodwill and other intangible assets |  |
Number of Reportable Segments | segment | 1 |
Goodwill | $ 113,132 | 113,132
Gross intangible assets | 177,765 | 177,765
Accumulated amortization | $ 98,803 | 93,429
Work Truck Solutions |  |
Goodwill and other intangible assets |  |
Number of Reportable Segments | segment | 2 |
Gross intangible assets | $ 95,990 | 95,990
Accumulated amortization | $ 32,843 | $ 27,535

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