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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net unrealized gains on equity securities $ (6,660) $ 0 $ 25,172 $ 0    
Fee income     31,000      
Accounting Standards Update 2016-01            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net unrealized gains on equity securities     70,000      
Deferred income taxes     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]            
Tax benefit related to the revaluation of net deferred tax liabilities     $ (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