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OPERATING BUSINESS SEGMENT AND INTERNATIONAL OPERATION INFORMATION (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |
Number of business segments | 4 |
Selling, General and Administrative Expenses |  |
Segment Reporting Information [Line Items] |  |
Service fees | $ | $ 9.4 | $ 11.5
NSP Americas; NSP Russia, Central and Eastern Europe; and NSP China |  |
Segment Reporting Information [Line Items] |  |
Number of operating segments | 3 |
Synergy WorldWide |  |
Segment Reporting Information [Line Items] |  |
Number of operating segments | 1 |

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- Definition Service Fees + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |