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SIGNIFICANT ACCOUNTING POLICES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ (6,910,065) | $ (5,556,273) | $ (4,970,208) |  |
Underwriting income (loss) | $ 194,664 | $ (59,026) | $ (115,726) | $ (143,737) | $ (26,130) | $ 512,853 | $ (57,012) | $ (16,385) |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 32,000 |  |  |  |
Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 13,000 |  |  |
Unrealized gains on equity securities, net of tax, in AOCI |  |  |  |  | 70,000 |  |  |  |  | 70,000 |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in tax rate, deferred tax liability, provisional income tax benefit |  |  |  |  |  |  |  |  |  | 2,000 |  |  |
Retained earnings | Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of ASU |  |  |  |  | (69,604) |  |  |  |  | (69,604) | 0 |  | $ 0
Retained earnings | Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of adoption of ASU |  |  |  |  | $ 2,106 |  |  |  |  | 2,106 | 0 |  | $ 0
Accounting Standards Update 2018-11 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, liability |  |  |  |  |  |  |  |  |  |  |  | $ 149,000 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | (6,910,065) | (5,556,273) | (4,970,208) |  |
Underwriting income (loss) |  |  |  |  |  |  |  |  | (123,827) | 413,326 | (279,073) |  |
Operating Segments | Insurance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | (3,797,592) | (2,814,918) | (2,432,475) |  |
Underwriting income (loss) |  |  |  |  |  |  |  |  | (77,298) | 241,642 | (22,630) |  |
Operating Segments | Insurance | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  |  | 313,000 | 288,000 |  |
Underwriting income (loss) |  |  |  |  |  |  |  |  |  | 14,000 | 15,000 |  |
Operating Segments | Reinsurance |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | (3,112,473) | (2,741,355) | (2,537,733) |  |
Underwriting income (loss) |  |  |  |  |  |  |  |  | $ (46,529) | 171,684 | (256,443) |  |
Operating Segments | Reinsurance | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  |  | (313,000) | (288,000) |  |
Underwriting income (loss) |  |  |  |  |  |  |  |  |  | $ (14,000) | $ (15,000) |  |

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