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Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment information |  |  |  |  |
Number of business segments | segment |  |  | 4 |  |
Net sales: |  |  |  |  |
Total net sales revenue | $ 88,828 | $ 89,301 | $ 267,436 | $ 253,743 |
Contribution margin: |  |  |  |  |
Total contribution margin | 35,156 | 35,080 | 103,919 | 99,326 |
Selling, general and administrative expenses | 31,643 | 32,926 | 97,339 | 95,098 |
Operating income | 3,513 | 2,154 | 6,580 | 4,228 |
Other income (loss), net | (353) | 193 | (1,420) | 1,909 |
Income before provision for income taxes | 3,160 | 2,347 | 5,160 | 6,137 |
Property, plant and equipment: |  |  |  |  |
Total property, plant and equipment | 65,531 |  | 65,531 |  | $ 69,106
United States |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 33,182 | 35,124 | 101,322 | 106,664 |
Property, plant and equipment: |  |  |  |  |
Total property, plant and equipment | 62,504 |  | 62,504 |  | 65,928
South Korea |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 18,271 | 14,371 | 52,463 | 38,203 |
Other Countries |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 37,375 | 39,806 | 113,651 | 108,876 |
Other |  |  |  |  |
Property, plant and equipment: |  |  |  |  |
Total property, plant and equipment | 3,027 |  | $ 3,027 |  | $ 3,178
NSP Americas; NSP Russia, Central and Eastern Europe; and NSP China |  |  |  |  |
Segment information |  |  |  |  |
Number of operating segments | segment |  |  | 3 |  |
NSP Americas |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 38,512 | 41,301 | $ 118,769 | 125,367 |
Contribution margin: |  |  |  |  |
Total contribution margin | 17,006 | 17,764 | 49,530 | 53,454 |
NSP Americas | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 16,706 | 18,211 | 51,506 | 56,258 |
NSP Americas | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 4,304 | 4,938 | 13,693 | 13,180 |
NSP Americas | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 3,000 | 3,434 | 8,974 | 9,570 |
NSP Americas | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 11,013 | 11,084 | 33,967 | 34,892 |
NSP Americas | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,735 | 2,114 | 5,070 | 5,487 |
NSP Americas | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,754 | 1,520 | 5,559 | 5,980 |
NSP Russia, Central and Eastern Europe |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 8,841 | 7,681 | 27,799 | 23,286 |
Contribution margin: |  |  |  |  |
Total contribution margin | 3,098 | 2,592 | 9,437 | 6,173 |
NSP Russia, Central and Eastern Europe | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 3,632 | 3,449 | 11,883 | 10,594 |
NSP Russia, Central and Eastern Europe | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 886 | 861 | 2,808 | 2,397 |
NSP Russia, Central and Eastern Europe | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 681 | 592 | 2,048 | 1,699 |
NSP Russia, Central and Eastern Europe | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 2,196 | 2,110 | 7,137 | 6,348 |
NSP Russia, Central and Eastern Europe | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,222 | 472 | 3,084 | 1,556 |
NSP Russia, Central and Eastern Europe | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 224 | 197 | $ 839 | 692 |
Synergy WorldWide |  |  |  |  |
Segment information |  |  |  |  |
Number of operating segments | segment |  |  | 1 |  |
Net sales: |  |  |  |  |
Total net sales revenue | 34,497 | 34,470 | $ 103,034 | 92,146 |
Contribution margin: |  |  |  |  |
Total contribution margin | 9,652 | 10,160 | 30,915 | 27,769 |
Synergy WorldWide | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 10,544 | 9,268 | 29,747 | 23,579 |
Synergy WorldWide | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 57 | 119 | 346 | 357 |
Synergy WorldWide | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 14,798 | 14,369 | 43,511 | 38,075 |
Synergy WorldWide | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 3,803 | 4,428 | 11,665 | 12,047 |
Synergy WorldWide | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,520 | 1,891 | 5,968 | 5,884 |
Synergy WorldWide | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 3,775 | 4,395 | 11,797 | 12,204 |
NSP China |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 6,978 | 5,849 | 17,834 | 12,944 |
Contribution margin: |  |  |  |  |
Total contribution margin | 5,400 | 4,564 | 14,037 | 11,930 |
NSP China | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 627 | 1,151 | 1,764 | 2,470 |
NSP China | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 156 | 179 | 312 | 310 |
NSP China | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 850 | 911 | 3,259 | 2,368 |
NSP China | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 3,032 | 2,433 | 8,357 | 5,557 |
NSP China | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,128 | 115 | 2,388 | 184 |
NSP China | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,185 | 1,060 | 1,754 | 2,055 |
NSP China | Hong Kong |  |  |  |  |
Contribution margin: |  |  |  |  |
Selling, general and administrative expenses | $ 2,700 | $ 2,100 | $ 6,700 | $ 4,700 |

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