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BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |
Bargain purchase gain |  | $ 15,044 | $ 0 | $ 15,044 | $ 0
Compagnie Belge d'Assurances Aviation NV/SA [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Interests acquired | 100.00% |  |  |  |
Investments, fair value | $ 182,000 |  |  |  |
Reserves for losses and loss expenses with a fair value | 79,000 |  |  |  |
Bargain purchase gain | $ 15,000 |  |  |  |

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