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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net unrealized gains (losses) on equities $ (20,813) $ 0    
Accounting Standards Update 2018-02 | Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of adoption of ASU     $ (2,142) $ 0
Accounting Standards Update 2016-01        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net unrealized gains (losses) on equities 70,000      
Deferred Income Tax Expense (Benefit) 13,000      
Accounting Standards Update 2016-01 | Retained earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of adoption of ASU     $ 69,604 $ 0
Service Fees and Reimbursement of Expenses        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue from contract with customer, $ 10,000