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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |
Other investments |  | $ 787,787 | $ 1,009,373 |
Ceded premiums |  | 2,251,103 | 1,529,130 | $ 1,217,234
Ceded losses and loss expenses |  | 1,565,000 | 1,010,000 | 556,000
Insurance and reinsurance balances payable |  | 1,338,991 | 899,064 |
Stone Point Group |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 2,000 | 2,000 | 3,000
NXT Capital II |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other investments |  | 18,000 |  |
NXT Capital III |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other investments |  | 20,000 |  |
NXT Capital |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 1,000 | 1,000 | 1,000
Freedom Consumer Credit Fund, LLC Series B |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 2,000 | 1,000 |
Other investments |  | 50,000 |  |
Chairman |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 500 | 500 | $ 600
Significant influence |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other investments |  | 450,000 | 451,000 |
Harrington Re |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded premiums |  | 194,000 | 213,000 |
Ceded losses and loss expenses |  | 142,000 | 119,000 |
Reinsurance recoverable on unpaid and paid losses |  | 363,000 | 152,000 |
Insurance and reinsurance balances payable |  | 115,000 | 142,000 |
Ventures Re |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded premiums |  | 182,000 | 107,000 |
Ceded losses and loss expenses |  | 138,000 | 126,000 |
Reinsurance recoverable on unpaid and paid losses |  | 186,000 | 131,000 |
Insurance and reinsurance balances payable |  | $ 67,000 | $ 17,000 |
Scenario, Forecast | Chairman |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party | $ 500 |  |  |
Stone Point Group | NXT Capital |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage ownership by related parties |  |  | 43.00% |
Stone Point Group | Pantheon |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage ownership by related parties |  | 14.50% |  |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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