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BASIS OF PRESENTATION AND SIGNIFICATION ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 6,898,858 | $ 6,910,065 | $ 5,556,273 |
Underwriting income (loss) | $ 49,254 | $ 78,718 | $ (78,659) | $ (77,822) | $ 194,664 | $ (59,026) | $ (115,726) | $ (143,737) |  |  |  |
Operating lease right-of-use assets | 111,092 |  |  |  |  |  |  |  | 111,092 |  |  |
Operating lease liabilities | $ 115,584 |  |  |  |  |  |  |  | 115,584 |  |  |
Short-term lease expense |  |  |  |  |  |  |  |  | 1,132 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  |  |  |  |  | $ 150,000
Operating lease liabilities |  |  |  | $ 150,000 |  |  |  |  |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 6,898,858 | 6,910,065 | 5,556,273 |
Underwriting income (loss) |  |  |  |  |  |  |  |  | (28,507) | (123,827) | 413,326 |
Operating Segments | Insurance |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 3,675,931 | 3,797,592 | 2,814,918 |
Underwriting income (loss) |  |  |  |  |  |  |  |  | (44,019) | (77,298) | 241,642 |
Operating Segments | Insurance | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  |  |  | (313,000) |
Underwriting income (loss) |  |  |  |  |  |  |  |  |  |  | 14,000 |
Operating Segments | Reinsurance |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 3,222,927 | 3,112,473 | 2,741,355 |
Underwriting income (loss) |  |  |  |  |  |  |  |  | $ 15,512 | $ (46,529) | 171,684 |
Operating Segments | Reinsurance | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  |  |  | 313,000 |
Underwriting income (loss) |  |  |  |  |  |  |  |  |  |  | $ (14,000) |

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