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Segment Information Revenues and Operating Net Assets by Geographical Areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net Sales | $ 817,740 | $ 794,020 | $ 863,980
Long-lived Assets | 703,860 | 708,160 | 833,920
Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net Sales | 62,360 | 65,490 | 70,760
Long-lived Assets | 54,790 | 45,050 | 50,930
Asia Pacific [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net Sales | 36,630 | 32,230 | 30,280
Long-lived Assets | 51,120 | 51,060 | 49,830
Other Americas [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net Sales | 15,260 | 13,620 | 17,000
Long-lived Assets | 7,930 | 7,800 | 5,840
Non-US [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net Sales | 114,250 | 111,340 | 118,040
Long-lived Assets | 113,840 | 103,910 | 106,600
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net Sales | 703,490 | 682,680 | 745,940
Long-lived Assets | $ 590,020 | $ 604,250 | $ 727,320

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