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OPERATING BUSINESS SEGMENT AND INTERNATIONAL OPERATION INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales | $ 91,695 | $ 88,524 | $ 90,724 | $ 91,272 | $ 97,374 | $ 88,828 | $ 91,266 | $ 87,342 | $ 362,215 | $ 364,810
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 144,865 | 143,782
Selling, general and administrative | 32,692 | 31,177 | 31,019 | 33,852 | 41,092 | 31,643 | 33,310 | 32,386 | 128,740 | 138,431
Operating income | 3,908 | 4,701 | 4,538 | 2,978 | (1,229) | 3,513 | 2,186 | 881 | 16,125 | 5,351
Other income (loss), net | 502 | $ (1,243) | $ 306 | $ (48) | (731) | $ (353) | $ (1,807) | $ 740 | (483) | (2,151)
Income from operations before provision for income taxes |  |  |  |  |  |  |  |  | 15,642 | 3,200
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 5,915 | 4,803
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 10,599 | 9,806
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 213,068 |  |  |  | 193,016 |  |  |  | 213,068 | 193,016
Property, plant and equipment |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 59,512 |  |  |  | 64,061 |  |  |  | 59,512 | 64,061
United States |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 128,019 | 133,677
Property, plant and equipment |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 54,470 |  |  |  | 60,606 |  |  |  | 54,470 | 60,606
South Korea |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 70,556 | 72,207
Other |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 163,640 | 158,926
Property, plant and equipment |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 5,042 |  |  |  | 3,455 |  |  |  | 5,042 | 3,455
Asia |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 138,536 | 139,031
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 65,871 | 67,733
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 3,262 | 1,557
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 1,544 | 799
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 65,959 |  |  |  | 59,983 |  |  |  | 65,959 | 59,983
Asia | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 37,795 | 32,519
Asia | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 940 | 3,086
Asia | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 44,541 | 49,210
Asia | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 24,434 | 24,015
Asia | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 13,753 | 10,286
Asia | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 17,073 | 19,915
Europe |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 62,523 | 56,314
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 19,954 | 17,845
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 27 | 85
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 75 | 107
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 15,187 |  |  |  | 16,414 |  |  |  | 15,187 | 16,414
Europe | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 22,469 | 20,932
Europe | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 5,130 | 3,775
Europe | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 10,672 | 11,307
Europe | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 14,456 | 12,478
Europe | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 7,463 | 5,253
Europe | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,333 | 2,569
Synergy WorldWide |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 138,163 | 144,264
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 49,327 | 48,448
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 2,605 | 3,143
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 8,855 | 8,718
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 124,337 |  |  |  | 109,091 |  |  |  | 124,337 | 109,091
Synergy WorldWide | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 59,847 | 62,519
Synergy WorldWide | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 15,341 | 16,202
Synergy WorldWide | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 18,750 | 19,518
Synergy WorldWide | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 33,077 | 33,925
Synergy WorldWide | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 6,170 | 5,751
Synergy WorldWide | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 4,978 | 6,349
Latin America and Other |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 22,993 | 25,201
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 9,713 | 9,756
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 21 | 18
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 125 | 182
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | $ 7,585 |  |  |  | $ 7,528 |  |  |  | 7,585 | 7,528
Latin America and Other | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 6,919 | 7,584
Latin America and Other | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,453 | 2,565
Latin America and Other | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,446 | 1,427
Latin America and Other | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 10,258 | 11,360
Latin America and Other | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,056 | 1,214
Latin America and Other | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 861 | $ 1,051

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