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Summary of Significant Accounting Policies - Impairment and Intangibles (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($)
Goodwill and other intangible assets |  |
Number of Reporting Units | item | 3 |
Goodwill | $ 113,134 | $ 241,006
Goodwill impairment | 0 | 0
Impairment of long-lived assets | 127,872 |
Intangible assets | 273,755 | 275,675
Gross intangible assets | 196,155 | 198,075
Accumulated amortization | 120,964 | 111,953
Dealer network |  |
Goodwill and other intangible assets |  |
Gross intangible assets | 80,000 | 80,000
Accumulated amortization | $ 67,000 | 63,000
Dealer network | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 15 years |
Dealer network | Maximum |  |
Goodwill and other intangible assets |  |
Amortization period | 20 years |
Trademarks |  |
Goodwill and other intangible assets |  |
Gross intangible assets | $ 5,459 | 5,459
Accumulated amortization | $ 3,807 | 3,713
Trademarks | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 7 years |
Trademarks | 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 | $ 14,484 | 13,229
Patents | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 7 years |
Patents | Maximum |  |
Goodwill and other intangible assets |  |
Amortization period | 20 years |
Customer relationships |  |
Goodwill and other intangible assets |  |
Gross intangible assets | $ 80,920 | 80,920
Accumulated amortization | $ 27,196 | 21,914
Customer relationships | Minimum |  |
Goodwill and other intangible assets |  |
Amortization period | 15 years |
Customer relationships | 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 | $ 8,477 | 8,177
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 |  |
Goodwill | 113,132 |
Gross intangible assets | 177,765 | 177,785
Accumulated amortization | 93,429 | 87,964
Work Truck Solutions |  |
Goodwill and other intangible assets |  |
Gross intangible assets | 95,990 | 97,890
Accumulated amortization | $ 27,535 | $ 23,989

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