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Segment Information Revenues and Operating Net Assets by Geographical Areas (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
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 170,920 | $ 188,410 | $ 190,830 | $ 173,370 | $ 170,090 | $ 182,100 | $ 181,690 | $ 171,150 | $ 723,530 | $ 705,030 | $ 656,160
Long-lived Assets | 710,360 |  |  |  | 656,490 |  |  |  | 710,360 | 656,490 | 679,050
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 87,420 | 54,920 | 55,290
Long-lived Assets | 110,530 |  |  |  | 53,770 |  |  |  | 110,530 | 53,770 | 54,090
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 37,920 | 38,920 | 28,200
Long-lived Assets | 40,720 |  |  |  | 44,230 |  |  |  | 40,720 | 44,230 | 49,800
Other Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,290 | 6,170 | 6,570
Long-lived Assets | 18,430 |  |  |  | 7,500 |  |  |  | 18,430 | 7,500 | 7,560
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 131,630 | 100,010 | 90,060
Long-lived Assets | 169,680 |  |  |  | 105,500 |  |  |  | 169,680 | 105,500 | 111,450
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 591,900 | 605,020 | 566,100
Long-lived Assets | $ 540,680 |  |  |  | $ 550,990 |  |  |  | $ 540,680 | $ 550,990 | $ 567,600

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