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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Costs, Foreign Currency Translation, and Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Incentive Trip Accrual        
Convention and meeting costs   $ 6,540 $ 4,970  
Foreign Currency Translation        
Minimum cumulative inflation rate for considering a country to have a highly inflationary economy (as a percent)   100.00%    
Period of cumulative inflation rate for considering a country to have a highly inflationary economy   3 years    
Advertising Costs        
Advertising costs   $ 1,900 2,100 $ 1,900
Research and Development        
Research and development expenses   2,800 $ 3,400 $ 3,200
CEO Related Transition Costs        
Transition expenses $ 2,400      
Accrued transition costs   $ 1,000