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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 |  |  |

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