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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |
Unfunded commitments related to other investments |  | $ 414,000 | $ 401,000 |
Ceded premiums |  | 1,529,130 | 1,217,234 | $ 929,064
Ceded losses and loss expenses |  | 1,010,000 | 556,000 | 577,000
Reinsurance recoverable on unpaid and paid losses |  | 3,338,840 | 2,334,922 |
Insurance and reinsurance balances payable |  | 899,064 | 493,183 |
Stone Point Group |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 2,000 | 3,000 | 3,000
StoneRiver RegEd |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  |  |  | 500
NXT Capital II |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Unfunded commitments related to other investments |  | 30,000 |  |
NXT Capital III |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Unfunded commitments related to other investments |  | 30,000 |  |
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 |  | 1,100 |  |
Unfunded commitments related to other investments |  | 50,000 |  |
Chairman |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 500 | 600 | $ 1,000
Significant influence |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amounts of transactions with related parties |  | 451,000 | 411,000 |
Harrington Re |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded premiums |  | 213,000 | 128,000 |
Ceded losses and loss expenses |  | 119,000 | 27,000 |
Reinsurance recoverable on unpaid and paid losses |  | 152,000 | 38,000 |
Insurance and reinsurance balances payable |  | 142,000 | 86,000 |
Ventures Re |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded premiums |  | 107,000 | 40,000 |
Ceded losses and loss expenses |  | 126,000 | 10,000 |
Reinsurance recoverable on unpaid and paid losses |  | 131,000 | 22,000 |
Insurance and reinsurance balances payable |  | $ 17,000 | $ 15,000 |
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 |  | 42.00% |  |
Stone Point Group | Pantheon |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage ownership by related parties |  | 14.50% |  |

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- Definition Percentage of NXT Capital's ordinary shares outstanding held by Stone Point Capital. + References No definition available. + Details
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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258 + Details
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- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 + Details
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