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TRANSACTIONS WITH RELATED PARTIES AND AFFILIATES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Commissions and incentives $ 74,550 $ 74,215
Directors, Officers and Family Members on M5M Foundation Board    
Related Party Transaction [Line Items]    
Cash donations 500 600
Son of the Chairman of the Board    
Related Party Transaction [Line Items]    
Officers' compensation 275 294
Member of the Board of Directors and Family    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives 2,400 2,900
Member of the Board of Directors    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives 2,200 2,700
Family members of a Member of the Board of Directors    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives 200 200
Son of member of Board of Directors    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives 200 200
Professional fees 100  
Daughter and Daughter-in-law of Member of Board of Directors    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives 100 100
Second son of member of Board of Directors    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives 100 100
Immediate Family Member Of Management Or Principal Owner Three    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives 100 100
Commissions and incentives 100 $ 100
Transfer Of Associate Position    
Related Party Transaction [Line Items]    
Payment of employment related commissions and incentives $ 1,000