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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, 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
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 211,350 | $ 223,780 | $ 224,910 | $ 217,100 | $ 195,210 | $ 209,330 | $ 213,370 | $ 199,830 | $ 877,140 | $ 817,740 | $ 794,020
Long-lived Assets | 678,980 |  |  |  | 703,860 |  |  |  | 678,980 | 703,860 | 708,160
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 62,420 | 62,360 | 65,490
Long-lived Assets | 54,340 |  |  |  | 54,790 |  |  |  | 54,340 | 54,790 | 45,050
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 45,040 | 36,630 | 32,230
Long-lived Assets | 45,160 |  |  |  | 51,120 |  |  |  | 45,160 | 51,120 | 51,060
Other Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,670 | 15,260 | 13,620
Long-lived Assets | 7,830 |  |  |  | 7,930 |  |  |  | 7,830 | 7,930 | 7,800
Non-US [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 122,130 | 114,250 | 111,340
Long-lived Assets | 107,330 |  |  |  | 113,840 |  |  |  | 107,330 | 113,840 | 103,910
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 755,010 | 703,490 | 682,680
Long-lived Assets | $ 571,650 |  |  |  | $ 590,020 |  |  |  | $ 571,650 | $ 590,020 | $ 604,250

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