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Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment information |  |  |  |  |
Number of business segments | segment |  |  | 4 |  |
Number of operating segments | segment |  |  | 3 |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | $ 85,441 | $ 79,586 | $ 257,209 | $ 244,711 |
Contribution margin: |  |  |  |  |
Total contribution margin | 34,245 | 30,253 | 100,247 | 92,489 |
Selling, general and administrative | 29,187 | 27,115 | 88,821 | 80,837 |
Operating income | 5,058 | 3,138 | 11,426 | 11,652 |
Other income (expense), net | 20 | (247) | 957 | (567) |
Income from continuing operations before provision for income taxes | 5,078 | 2,891 | 12,383 | 11,085 |
Property, plant and equipment |  |  |  |  |
Total property, plant and equipment | 72,921 |  | 72,921 |  | $ 68,728
United States |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 36,473 | 36,603 | 112,366 | 112,179 |
Property, plant and equipment |  |  |  |  |
Total property, plant and equipment | 70,420 |  | 70,420 |  | 66,044
Other |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 34,885 | 30,792 | 102,089 | 96,191 |
Property, plant and equipment |  |  |  |  |
Total property, plant and equipment | 2,501 |  | 2,501 |  | $ 2,684
South Korea (Synergy) |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 14,083 | 12,191 | 42,754 | 36,341 |
NSP Americas |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 43,260 | 44,483 | 133,168 | 136,043 |
Contribution margin: |  |  |  |  |
Total contribution margin | 19,057 | 18,685 | 57,077 | 57,232 |
NSP Americas | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 19,063 | 20,119 | 58,914 | 59,607 |
NSP Americas | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 4,599 | 5,095 | 13,913 | 16,350 |
NSP Americas | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 3,193 | 3,026 | 9,723 | 9,670 |
NSP Americas | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 11,684 | 12,521 | 36,608 | 39,149 |
NSP Americas | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,925 | 952 | 5,708 | 2,792 |
NSP Americas | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 2,796 | 2,770 | 8,302 | 8,475 |
NSP Russia, Central and Eastern Europe |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 6,421 | 6,321 | 19,042 | 20,579 |
Contribution margin: |  |  |  |  |
Total contribution margin | 2,231 | 2,287 | 6,477 | 7,197 |
NSP Russia, Central and Eastern Europe | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 2,732 | 2,532 | 7,956 | 8,210 |
NSP Russia, Central and Eastern Europe | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 650 | 770 | 2,047 | 2,446 |
NSP Russia, Central and Eastern Europe | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 538 | 391 | 1,508 | 1,290 |
NSP Russia, Central and Eastern Europe | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,741 | 1,829 | 5,269 | 5,651 |
NSP Russia, Central and Eastern Europe | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 517 | 563 | 1,619 | 2,072 |
NSP Russia, Central and Eastern Europe | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 243 | 236 | 643 | 910 |
Synergy WorldWide |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 31,331 | 27,797 | 94,192 | 85,045 |
Contribution margin: |  |  |  |  |
Total contribution margin | 9,556 | 8,809 | 28,740 | 26,677 |
Synergy WorldWide | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 8,711 | 8,006 | 27,045 | 23,353 |
Synergy WorldWide | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 205 | 91 | 455 | 368 |
Synergy WorldWide | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 13,188 | 11,831 | 39,386 | 36,898 |
Synergy WorldWide | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 3,383 | 2,485 | 9,312 | 7,153 |
Synergy WorldWide | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,838 | 1,784 | 5,725 | 5,346 |
Synergy WorldWide | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 4,006 | 3,600 | 12,269 | 11,927 |
China and New Markets |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 4,429 | 985 | 10,807 | 3,044 |
Contribution margin: |  |  |  |  |
Total contribution margin | 3,401 | 472 | 7,953 | 1,383 |
China and New Markets | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 575 | 471 | 2,583 | 1,428 |
China and New Markets | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 206 | 123 | 553 | 384 |
China and New Markets | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 948 | 70 | 2,471 | 224 |
China and New Markets | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 2,118 | 240 | 3,640 | 755 |
China and New Markets | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 189 | 24 | 650 | 70 |
China and New Markets | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 393 | 57 | 910 | 183 |
China and New Markets | Hong Kong |  |  |  |  |
Contribution margin: |  |  |  |  |
Selling, general and administrative | $ 1,500 | $ 0 | $ 3,400 | $ 0 |

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