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Amortizable Intangible Assets - Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount | $ 59,256 |  |  |  | $ 53,178 |  |  |  | $ 59,256 | $ 53,178 |
Accumulated Amortization | (34,185) |  |  |  | (28,776) |  |  |  | (34,185) | (28,776) |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | (5,500) | (6,000) | $ (6,100)
Intangible assets, net | 25,071 |  |  |  | 24,402 |  |  |  | 25,071 | 24,402 |
Finite-lived Intangible Assets, Purchase Of Intangibles |  |  |  |  |  |  |  |  | 2,081 |  |
Goodwill, Other Increase (Decrease) |  |  |  |  |  |  |  |  | 320 |  |
Impairment of goodwill | 0 | $ 0 | $ 0 | $ 0 | 6,686 | $ 0 | $ 0 | $ 0 | 0 | 6,686 | 0
Foreign exchange |  |  |  |  |  |  |  |  | 10 |  |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net |  |  |  |  |  |  |  |  | 0 | 0 |
2019 | 5,933 |  |  |  |  |  |  |  | 5,933 |  |
2020 | 5,341 |  |  |  |  |  |  |  | 5,341 |  |
2021 | 3,436 |  |  |  |  |  |  |  | 3,436 |  |
2022 | 2,616 |  |  |  |  |  |  |  | 2,616 |  |
2023 | 1,665 |  |  |  |  |  |  |  | 1,665 |  |
Thereafter | 5,464 |  |  |  |  |  |  |  | 5,464 |  |
Finite-Lived Intangible Assets, Net | 24,455 |  |  |  |  |  |  |  | 24,455 |  |
Increase (Decrease) in Other Current Assets |  |  |  |  |  |  |  |  | (3,808) | 5,297 | (2,016)
Patents |  |  |  |  |  |  |  |  |  |  |
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount | 4,659 |  |  |  | 2,109 |  |  |  | 4,659 | 2,109 | 2,350
Accumulated Amortization | (561) |  |  |  | (411) |  |  |  | (561) | (411) | (545)
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | (150) | (107) |
Intangible assets, net | 4,098 |  |  |  | 1,698 |  |  |  | 4,098 | 1,698 | 1,805
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  | 2,550 |  |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross |  |  |  |  |  |  |  |  |  | (241) |
Accumulated amortization of removal of fully amortized asset |  |  |  |  |  |  |  |  |  | 241 |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net |  |  |  |  |  |  |  |  |  | 0 |
Unpatented Technology |  |  |  |  |  |  |  |  |  |  |
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount | 21,616 |  |  |  | 20,662 |  |  |  | 21,616 | 20,662 | 21,667
Accumulated Amortization | (14,361) |  |  |  | (12,344) |  |  |  | (14,361) | (12,344) | (10,979)
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | (2,017) | (2,557) |
Intangible assets, net | 7,255 |  |  |  | 8,318 |  |  |  | 7,255 | 8,318 | 10,688
Reclassifications |  |  |  |  |  |  |  |  |  | (277) |
Foreign exchange |  |  |  |  |  |  |  |  | 166 | (90) |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross |  |  |  |  |  |  |  |  |  | (1,192) |
Accumulated amortization of removal of fully amortized asset |  |  |  |  |  |  |  |  |  | 1,192 |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net |  |  |  |  |  |  |  |  |  | 0 |
Noncompete Agreements Trademarks and Other |  |  |  |  |  |  |  |  |  |  |
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount | 14,703 |  |  |  | 12,225 |  |  |  | 14,703 | 12,225 | 12,225
Accumulated Amortization | (5,529) |  |  |  | (3,719) |  |  |  | (5,529) | (3,719) | (2,817)
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | (1,910) | (1,757) |
Intangible assets, net | 9,174 |  |  |  | 8,506 |  |  |  | 9,174 | 8,506 | 9,408
Finite-lived Intangible Assets, Purchase Of Intangibles |  |  |  |  |  |  |  |  | 2,081 |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  | 6 | 879 |
Reclassifications |  |  |  |  |  |  |  |  | 481 | (24) |
Foreign exchange |  |  |  |  |  |  |  |  | 10 |  |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Gross |  |  |  |  |  |  |  |  | (100) | (855) |
Accumulated amortization of removal of fully amortized asset |  |  |  |  |  |  |  |  | 100 | 855 |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount | 17,660 |  |  |  | 17,563 |  |  |  | 17,660 | 17,563 | 17,678
Accumulated Amortization | (13,732) |  |  |  | (12,299) |  |  |  | (13,732) | (12,299) | (10,869)
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | (1,433) | (1,430) |
Intangible assets, net | 3,928 |  |  |  | 5,264 |  |  |  | 3,928 | 5,264 | $ 6,809
Foreign exchange |  |  |  |  |  |  |  |  | (27) | (115) |
North America |  |  |  |  |  |  |  |  |  |  |
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Amount | 33,756 |  |  |  | 30,825 |  |  |  | 33,756 | 30,825 |
Accumulated Amortization | (19,173) |  |  |  | (16,002) |  |  |  | (19,173) | (16,002) |
Intangible assets, net | $ 14,583 |  |  |  | $ 14,823 |  |  |  | 14,583 | 14,823 |
Goodwill, Other Increase (Decrease) |  |  |  |  |  |  |  |  | 320 |  |
Impairment of goodwill |  |  |  |  |  |  |  |  | 0 | 0 |
Increase (Decrease) in Other Current Assets |  |  |  |  |  |  |  |  | (161) |  |
North America | Noncompete Agreements Trademarks and Other |  |  |  |  |  |  |  |  |  |  |
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Reclassifications |  |  |  |  |  |  |  |  | $ (481) |  |
Europe | Noncompete Agreements Trademarks and Other |  |  |  |  |  |  |  |  |  |  |
Amortizable Intangible assets |  |  |  |  |  |  |  |  |  |  |
Reclassifications |  |  |  |  |  |  |  |  |  | $ (24) |
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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