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Other Intangible Asset - Summary (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Other intangible assets |  |
Amortizable intangibles, gross carrying amount | $ 196,155 | $ 196,155
Amortizable intangibles, accumulated amortization | 126,373 | 120,964
Finite-Lived Intangible Assets, Net, Total | 69,782 | 75,191
Intangible Assets, Gross (Excluding Goodwill), Total | 273,755 | 273,755
Net Carrying Amount | 147,382 | 152,791
Dealer network |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 80,000 | 80,000
Amortizable intangibles, accumulated amortization | 69,000 | 67,000
Finite-Lived Intangible Assets, Net, Total | 11,000 | 13,000
Customer relationships |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 80,920 | 80,920
Amortizable intangibles, accumulated amortization | 29,767 | 27,196
Finite-Lived Intangible Assets, Net, Total | 51,153 | 53,724
Patents |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 21,136 | 21,136
Amortizable intangibles, accumulated amortization | 15,112 | 14,484
Finite-Lived Intangible Assets, Net, Total | 6,024 | 6,652
Noncompete agreements |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 8,640 | 8,640
Amortizable intangibles, accumulated amortization | 8,640 | 8,477
Finite-Lived Intangible Assets, Net, Total |  | 163
Trademarks |  |
Other intangible assets |  |
Amortizable intangibles, gross carrying amount | 5,459 | 5,459
Amortizable intangibles, accumulated amortization | 3,854 | 3,807
Finite-Lived Intangible Assets, Net, Total | 1,605 | 1,652
Trademark and tradenames |  |
Other intangible assets |  |
Indefinite-lived intangibles, net carrying amount | $ 77,600 | $ 77,600

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