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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

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