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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net unrealized gains (losses) on equities $ 11,019 $ 0 $ 31,832 $ 0    
Fee income     18,000      
Accounting Standards Update 2016-01            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net unrealized gains (losses) on equities     69,604      
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
Accounting Standards Update 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferred tax liability, provisional income tax benefit     $ (2,000)      
Accounting Standards Update 2018-02 | Retained earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of adoption of ASU         $ 2,106 $ 0