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Amortizable Intangible Assets - Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amortizable Intangible assets |  |  |
Gross Carrying Amount | $ 67,127 | $ 59,256 |
Accumulated Amortization | (40,327) | (34,185) |
Amortization of Intangible Assets | (6,100) | (5,500) | $ (6,000)
Intangible assets, net | 26,800 | 25,071 |
Finite-lived Intangible Assets, Purchase Of Intangibles | 6,700 |  |
Capital expenditures and asset acquisitions, net of cash acquired | 40,706 | 40,176 | 31,317
Goodwill, Other Increase (Decrease) | 8 | 320 |
Impairment of goodwill | 0 | 0 | 6,686
Foreign exchange | 179 |  |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net |  | 0 |
2019 | 6,304 |  |
2020 | 4,205 |  |
2021 | 3,339 |  |
2022 | 2,290 |  |
2023 | 2,022 |  |
Thereafter | 8,024 |  |
Finite-Lived Intangible Assets, Net | 26,184 |  |
Increase (Decrease) in Other Current Assets | $ (845) | (3,808) | 5,297
Finite-Lived Intangible Assets, Remaining Amortization Period | 6 years 6 months |  |
Patents |  |  |
Amortizable Intangible assets |  |  |
Gross Carrying Amount | $ 4,699 | 4,659 | 2,109
Accumulated Amortization | (934) | (561) | (411)
Amortization of Intangible Assets | (373) | (150) |
Intangible assets, net | 3,765 | 4,098 | 1,698
Finite-lived Intangible Assets Acquired | 40 | 2,550 |
Unpatented Technology |  |  |
Amortizable Intangible assets |  |  |
Gross Carrying Amount | 22,104 | 21,616 | 20,662
Accumulated Amortization | (16,492) | (14,361) | (12,344)
Amortization of Intangible Assets | (2,131) | (2,017) |
Intangible assets, net | 5,612 | 7,255 | 8,318
Finite-lived Intangible Assets Acquired |  | 788 |
Foreign exchange | 488 | 166 |
Noncompete Agreements Trademarks and Other |  |  |
Amortizable Intangible assets |  |  |
Gross Carrying Amount | 21,582 | 14,703 | 12,225
Accumulated Amortization | (7,724) | (5,529) | (3,719)
Amortization of Intangible Assets | (2,195) | (1,910) |
Intangible assets, net | 13,858 | 9,174 | 8,506
Finite-lived Intangible Assets, Purchase Of Intangibles | 6,700 |  |
Finite-lived Intangible Assets Acquired |  | 2,081 |
Capital expenditures and asset acquisitions, net of cash acquired |  | 6 |
Reclassifications |  | 481 |
Foreign exchange | 179 | 10 |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross |  | (100) |
Accumulated amortization of removal of fully amortized asset |  | 100 |
Customer Relationships |  |  |
Amortizable Intangible assets |  |  |
Gross Carrying Amount | 18,123 | 17,660 | 17,563
Accumulated Amortization | (15,175) | (13,732) | (12,299)
Amortization of Intangible Assets | (1,443) | (1,433) |
Intangible assets, net | 2,948 | 3,928 | 5,264
Finite-lived Intangible Assets Acquired | 290 | 124 |
Foreign exchange | 173 | (27) |
North America |  |  |
Amortizable Intangible assets |  |  |
Gross Carrying Amount | 40,786 | 33,756 |
Accumulated Amortization | (22,697) | (19,173) |
Intangible assets, net | 18,089 | 14,583 |
Capital expenditures and asset acquisitions, net of cash acquired | 29,937 | 31,695 | $ 27,059
Goodwill, Other Increase (Decrease) | 0 | $ 320 |
Increase (Decrease) in Other Current Assets | (161) |  |
North America | Noncompete Agreements Trademarks and Other |  |  |
Amortizable Intangible assets |  |  |
Reclassifications | $ (481) |  |
Maximum |  |  |
Amortizable Intangible assets |  |  |
Finite-Lived Intangible Asset, Useful Life | 21 years |  |
Minimum |  |  |
Amortizable Intangible assets |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |

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