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Other Intangible Asset - Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other intangible assets |  |
Amortizable intangibles, gross carrying amount | $ 196,155 | $ 198,075
Amortizable intangibles, accumulated amortization | 120,964 | 111,953
Finite-Lived Intangible Assets, Net, Total | 75,191 | 86,122
Intangible Assets, Gross (Excluding Goodwill), Total | 273,755 | 275,675
Net Carrying Amount | 152,791 | 163,722
Dealer network |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 80,000 | 80,000
Amortizable intangibles, accumulated amortization | 67,000 | 63,000
Finite-Lived Intangible Assets, Net, Total | 13,000 | 17,000
Customer relationships |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 80,920 | 80,920
Amortizable intangibles, accumulated amortization | 27,196 | 21,914
Finite-Lived Intangible Assets, Net, Total | 53,724 | 59,006
Patents |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 21,136 | 21,136
Amortizable intangibles, accumulated amortization | 14,484 | 13,229
Finite-Lived Intangible Assets, Net, Total | 6,652 | 7,907
Noncompete agreements |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 8,640 | 8,640
Amortizable intangibles, accumulated amortization | 8,477 | 8,177
Finite-Lived Intangible Assets, Net, Total | 163 | 463
Trademarks |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 5,459 | 5,459
Amortizable intangibles, accumulated amortization | 3,807 | 3,713
Finite-Lived Intangible Assets, Net, Total | 1,652 | 1,746
Backlog |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount |  | 1,900
Amortizable intangibles, accumulated amortization |  | 1,900
License |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount |  | 20
Amortizable intangibles, accumulated amortization |  | 20
Trademark and tradenames |  |
Other intangible assets |  |
Indefinite-lived intangibles, net carrying amount | $ 77,600 | $ 77,600

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