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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |  |
Segment Information |  |  |  |  |  |
Net sales | $ 308,007 | $ 263,002 | $ 552,786 | $ 482,869 |  |
Income (Loss) from Operations | 60,744 | 45,137 | 93,540 | 67,768 |  |
Total Assets | 1,085,887 | 1,041,477 | 1,085,887 | 1,041,477 | $ 1,037,523 |
Cash and cash equivalent | 155,035 | 140,950 | 155,035 | 140,950 | 168,514 | $ 226,537
Intersegment elimination |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 7,626 | 6,650 | 15,127 | 12,596 |  |
Administrative and all other |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Income (Loss) from Operations | (1,125) | (1,083) | (2,800) | (3,190) |  |
Total Assets | (194,107) | (104,804) | (194,107) | (104,804) | (150,970) |
Cash and cash equivalent | 71,800 | 69,800 | 71,800 | 69,800 | 80,200 |
North America |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 259,822 | 215,739 | 466,034 | 399,510 |  |
Income (Loss) from Operations | 58,483 | 42,011 | 94,450 | 68,778 |  |
Total Assets | 1,042,765 | 915,661 | 1,042,765 | 915,661 | 953,033 |
North America | Intersegment elimination |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 578 | 928 | 1,206 | 1,778 |  |
Europe |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 45,784 | 45,234 | 82,077 | 79,615 |  |
Income (Loss) from Operations | 2,845 | 4,138 | 1,198 | 2,304 |  |
Total Assets | 208,609 | 205,614 | 208,609 | 205,614 | 208,640 |
Europe | Intersegment elimination |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 251 | 102 | 600 | 249 |  |
Asia/Pacific |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 2,401 | 2,029 | 4,675 | 3,744 |  |
Income (Loss) from Operations | 541 | 71 | 692 | (124) |  |
Total Assets | 28,620 | 25,006 | 28,620 | 25,006 | $ 26,820 |
Asia/Pacific | Intersegment elimination |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | $ 6,797 | $ 5,620 | $ 13,321 | $ 10,569 |  |

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