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Operating Segments and Geographic Information (Operations by Geographic Area) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 209,008 | $ 206,783 | $ 201,424 | $ 203,828 | $ 173,000 | $ 165,259 | $ 157,489 | $ 160,566 | $ 821,043 | $ 656,314 | $ 641,443
Long-Lived Assets | 576,996 |  |  |  | 522,894 |  |  |  | 576,996 | 522,894 | 429,133
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 225,621 | 158,136 | 164,478
Long-Lived Assets | 370,964 |  |  |  | 326,199 |  |  |  | 370,964 | 326,199 | 218,439
China |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 272,184 | 236,961 | 227,993
Long-Lived Assets | 57,404 |  |  |  | 62,728 |  |  |  | 57,404 | 62,728 | 65,994
Germany |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 89,203 | 79,480 | 76,569
Long-Lived Assets | 114,497 |  |  |  | 101,725 |  |  |  | 114,497 | 101,725 | 110,240
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 234,035 | 181,737 | 172,403
Long-Lived Assets | $ 34,131 |  |  |  | $ 32,242 |  |  |  | $ 34,131 | $ 32,242 | $ 34,460

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