Annual report pursuant to Section 13 and 15(d)

OPERATING BUSINESS SEGMENT AND INTERNATIONAL OPERATION INFORMATION (Narrative) (Details)

v3.20.1
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