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Operations and Summary of Significant Accounting Policies - Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount, balance at the beginning of the year | $ 51,442 |  |
Accumulated amortization, balance at the beginning of the year | (28,578) |  |
Intangible assets, net carrying amount, beginning of period | 22,864 |  |
Acquisition | 9,260 |  |
Amortization | (6,200) | $ (6,000) | $ (6,100)
Foreign exchange | 16 | (39) |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net | 0 | 0 |
Gross carrying amount, balance at the end of the year | 54,537 | 51,442 |
Accumulated amortization, balance at the end of the year | (25,211) | (28,578) |
Intangible assets, net carrying amount, end of period | 29,326 | 22,864 |
Reclassifications of goodwill | 189 | 439 |
Estimated future amortization of intangible assets |  |  |
2018 | 5,352 |  |
2019 | 5,260 |  |
2020 | 5,230 |  |
2021 | 4,751 |  |
2022 | 2,859 |  |
Thereafter | 5,258 |  |
Total | 28,710 |  |
Patents |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount, balance at the beginning of the year | 1,718 | 1,513 |
Accumulated amortization, balance at the beginning of the year | (528) | (379) |
Intangible assets, net carrying amount, beginning of period | 1,190 | 1,134 |
Acquisition | 800 |  |
Amortization | (187) | (149) |
Reclassifications |  | (212) |
Foreign exchange | 2 | (7) |
Removal of fully amortized asset, gross | (170) |  |
Accumulated amortization of removal of fully amortized asset | 170 |  |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net | 0 |  |
Gross carrying amount, balance at the end of the year | 2,350 | 1,718 | 1,513
Accumulated amortization, balance at the end of the year | (545) | (528) | (379)
Intangible assets, net carrying amount, end of period | 1,805 | 1,190 | 1,134
Noncompete Agreements Trademarks and Other [Member] |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount, balance at the beginning of the year | 6,727 | 10,578 |
Accumulated amortization, balance at the beginning of the year | (4,100) | (7,203) |
Intangible assets, net carrying amount, beginning of period | 2,627 | 3,375 |
Acquisition | 9,260 | 1,212 |
Amortization | (2,495) | (2,040) |
Reclassifications |  | (119) |
Foreign exchange | 16 | (39) |
Removal of fully amortized asset, gross | (3,778) | (5,143) |
Accumulated amortization of removal of fully amortized asset | 3,778 | 5,143 |
Gross carrying amount, balance at the end of the year | 12,225 | 6,727 | 10,578
Accumulated amortization, balance at the end of the year | (2,817) | (4,100) | (7,203)
Intangible assets, net carrying amount, end of period | 9,408 | 2,627 | 3,375
Unpatented Technology |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount, balance at the beginning of the year | 21,162 | 21,604 |
Accumulated amortization, balance at the beginning of the year | (9,003) | (8,656) |
Intangible assets, net carrying amount, beginning of period | 12,159 | 12,948 |
Amortization | (1,976) | (2,058) |
Reclassifications |  | (1,512) |
Foreign exchange | 505 | (243) |
Removal of fully amortized asset, gross |  | (1,711) |
Accumulated amortization of removal of fully amortized asset |  | 1,711 |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net |  | 0 |
Gross carrying amount, balance at the end of the year | 21,667 | 21,162 | 21,604
Accumulated amortization, balance at the end of the year | (10,979) | (9,003) | (8,656)
Intangible assets, net carrying amount, end of period | 10,688 | 12,159 | 12,948
Customer Relationships |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount, balance at the beginning of the year | 21,217 | 21,242 |
Accumulated amortization, balance at the beginning of the year | (14,945) | (13,152) |
Intangible assets, net carrying amount, beginning of period | 6,272 | 8,090 |
Acquisition | 1,091 | 0 |
Amortization | (1,574) | (1,793) |
Reclassifications | 626 | (46) |
Foreign exchange | 394 | (71) |
Removal of fully amortized asset, gross | (5,650) |  |
Accumulated amortization of removal of fully amortized asset | 5,650 |  |
Finite Lived Intangible Assets Removal of Fully Amortized Assets, Net | 0 |  |
Gross carrying amount, balance at the end of the year | 17,678 | 21,217 | 21,242
Accumulated amortization, balance at the end of the year | (10,869) | (14,945) | (13,152)
Intangible assets, net carrying amount, end of period | 6,809 | 6,272 | $ 8,090
North America |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Gross carrying amount, balance at the beginning of the year | 23,562 |  |
Accumulated amortization, balance at the beginning of the year | (13,811) |  |
Intangible assets, net carrying amount, beginning of period | 9,751 |  |
Gross carrying amount, balance at the end of the year | 30,775 | 23,562 |
Accumulated amortization, balance at the end of the year | (13,732) | (13,811) |
Intangible assets, net carrying amount, end of period | 17,043 | 9,751 |
Reclassifications of goodwill | (3) | $ 439 |
Europe | Customer Relationships |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Reclassifications | 600 |  |
Europe | Other Assets [Member] |  |  |
Changes in gross carrying amount of finite-lived intangible assets |  |  |
Reclassifications of Intangible Assets to other Non Current Assets | $ (600) |  |
Minimum |  |  |
Amortizable Intangible assets |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Maximum |  |  |
Amortizable Intangible assets |  |  |
Finite-Lived Intangible Asset, Useful Life | 21 years |  |

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