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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | 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 | $ 89,366 | $ 81,247 | $ 171,768 | $ 165,125 |
Contribution margin: |  |  |  |  |
Total contribution margin | 35,497 | 30,576 | 66,002 | 62,236 |
Selling, general and administrative | 31,249 | 27,392 | 59,634 | 53,722 |
Operating income | 4,248 | 3,184 | 6,368 | 8,514 |
Other income (expense), net | (622) | (2) | 937 | (320) |
Income from continuing operations before provision for income taxes | 3,626 | 3,182 | 7,305 | 8,194 |
Property, plant and equipment |  |  |  |  |
Total property, plant and equipment | 70,423 |  | 70,423 |  | $ 68,728
United States |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 37,598 | 37,054 | 75,893 | 75,576 |
Property, plant and equipment |  |  |  |  |
Total property, plant and equipment | 68,089 |  | 68,089 |  | 66,044
Other |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 36,295 | 32,123 | 67,204 | 65,399 |
Property, plant and equipment |  |  |  |  |
Total property, plant and equipment | 2,334 |  | 2,334 |  | $ 2,684
South Korea (Synergy) |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 15,473 | 12,070 | 28,671 | 24,150 |
NSP Americas |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 44,725 | 45,050 | 89,908 | 91,560 |
Contribution margin: |  |  |  |  |
Total contribution margin | 19,103 | 19,027 | 38,020 | 38,547 |
NSP Americas | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 20,234 | 19,456 | 39,851 | 39,488 |
NSP Americas | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 3,738 | 5,038 | 9,314 | 11,255 |
NSP Americas | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 3,418 | 3,543 | 6,530 | 6,644 |
NSP Americas | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 11,845 | 13,263 | 24,924 | 26,628 |
NSP Americas | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 2,853 | 870 | 3,783 | 1,840 |
NSP Americas | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 2,637 | 2,880 | 5,506 | 5,705 |
NSP Russia, Central and Eastern Europe |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 6,269 | 6,815 | 12,621 | 14,258 |
Contribution margin: |  |  |  |  |
Total contribution margin | 2,065 | 2,314 | 4,246 | 4,910 |
NSP Russia, Central and Eastern Europe | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 2,501 | 2,799 | 5,224 | 5,678 |
NSP Russia, Central and Eastern Europe | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 857 | 763 | 1,397 | 1,676 |
NSP Russia, Central and Eastern Europe | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 493 | 446 | 970 | 899 |
NSP Russia, Central and Eastern Europe | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,407 | 1,852 | 3,528 | 3,822 |
NSP Russia, Central and Eastern Europe | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 853 | 627 | 1,102 | 1,509 |
NSP Russia, Central and Eastern Europe | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 158 | 328 | 400 | 674 |
Synergy WorldWide |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 33,013 | 28,480 | 62,861 | 57,248 |
Contribution margin: |  |  |  |  |
Total contribution margin | 10,245 | 8,820 | 19,184 | 17,868 |
Synergy WorldWide | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 9,694 | 7,645 | 18,334 | 15,347 |
Synergy WorldWide | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 41 | 84 | 250 | 277 |
Synergy WorldWide | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 13,505 | 12,411 | 26,198 | 25,067 |
Synergy WorldWide | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 3,442 | 2,374 | 5,929 | 4,668 |
Synergy WorldWide | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,948 | 1,732 | 3,887 | 3,562 |
Synergy WorldWide | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 4,383 | 4,234 | 8,263 | 8,327 |
China and New Markets |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 5,359 | 902 | 6,378 | 2,059 |
Contribution margin: |  |  |  |  |
Total contribution margin | 4,084 | 415 | 4,552 | 911 |
China and New Markets | General health |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,537 | 426 | 2,008 | 957 |
China and New Markets | Immune |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 216 | 103 | 347 | 261 |
China and New Markets | Cardiovascular |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,450 | 73 | 1,523 | 154 |
China and New Markets | Digestive |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 1,262 | 225 | 1,522 | 515 |
China and New Markets | Personal care |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 439 | 19 | 461 | 46 |
China and New Markets | Weight management |  |  |  |  |
Net sales revenue: |  |  |  |  |
Total net sales revenue | 455 | 56 | 517 | 126 |
China and New Markets | Hong Kong |  |  |  |  |
Contribution margin: |  |  |  |  |
Selling, general and administrative | $ 2,000 | $ 0 | $ 2,000 | $ 0 |

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