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Goodwill- Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Carrying amount of goodwill by reportable segment |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | $ (6,200) | $ (6,000) | $ (6,100)
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Gross | $ 161,018 |  |  |  | $ 161,221 |  |  |  | 161,018 | 161,221 | 148,560
Accumulated impairment losses | (30,768) |  |  |  | (24,081) |  |  |  | (30,768) | (24,081) | (24,081)
Goodwill | 130,250 |  |  |  | 137,140 |  |  |  | 130,250 | 137,140 | 124,479
Goodwill acquired |  |  |  |  |  |  |  |  | 913 | 10,066 |
Foreign exchange |  |  |  |  |  |  |  |  | (1,116) | 2,784 |
Impairment of goodwill | 6,686 | $ 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0 | 6,686 | 0 | 0
Goodwill, Other Increase (Decrease) |  |  |  |  |  |  |  |  | (189) | (189) |
North America |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Gross | 107,101 |  |  |  | 106,421 |  |  |  | 107,101 | 106,421 | 96,154
Accumulated impairment losses | (10,666) |  |  |  | (10,666) |  |  |  | (10,666) | (10,666) | (10,666)
Goodwill | 96,435 |  |  |  | 95,755 |  |  |  | 96,435 | 95,755 | 85,488
Goodwill acquired |  |  |  |  |  |  |  |  | 913 | 10,066 |
Foreign exchange |  |  |  |  |  |  |  |  | (233) | 198 |
Impairment of goodwill |  |  |  |  |  |  |  |  | 0 |  |
Goodwill, Other Increase (Decrease) |  |  |  |  |  |  |  |  | 300 | 3 |
Europe |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Gross | 52,573 |  |  |  | 53,311 |  |  |  | 52,573 | 53,311 | 51,031
Accumulated impairment losses | (20,102) |  |  |  | (13,415) |  |  |  | (20,102) | (13,415) | (13,415)
Goodwill | 32,471 |  |  |  | 39,896 |  |  |  | 32,471 | 39,896 | 37,616
Goodwill acquired |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign exchange |  |  |  |  |  |  |  |  | (738) | 2,472 |
Impairment of goodwill |  |  |  |  |  |  |  |  | 6,686 |  |
Goodwill, Other Increase (Decrease) |  |  |  |  |  |  |  |  | (192) | (192) |
Asia/Pacific |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Gross | 1,344 |  |  |  | 1,489 |  |  |  | 1,344 | 1,489 | 1,375
Accumulated impairment losses | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Goodwill | $ 1,344 |  |  |  | $ 1,489 |  |  |  | 1,344 | 1,489 | $ 1,375
Goodwill acquired |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign exchange |  |  |  |  |  |  |  |  | (145) | 114 |
Impairment of goodwill |  |  |  |  |  |  |  |  | 0 |  |
Goodwill, Other Increase (Decrease) |  |  |  |  |  |  |  |  |  | 0 |
Patents |  |  |  |  |  |  |  |  |  |  |
Carrying amount of goodwill by reportable segment |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | (107) | (187) |
Noncompete Agreements Trademarks and Other |  |  |  |  |  |  |  |  |  |  |
Carrying amount of goodwill by reportable segment |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | (1,757) | (2,495) |
Reclassifications |  |  |  |  |  |  |  |  | 24 |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Carrying amount of goodwill by reportable segment |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  |  |  | $ (1,430) | (1,574) |
Reclassifications |  |  |  |  |  |  |  |  |  | $ 626 |

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