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RELATED PARTY TRANSACTIONS (DETAILS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |  |
Unfunded commitments related to other investments |  | $ 401,000 | $ 379,000 |
Percentage ownership by related parties |  | 45.00% |  |
Ceded premiums |  | $ 1,217,234 | 929,064 | $ 804,544
Ceded losses and loss expenses |  | 556,000 | 577,000 | 401,000
Reinsurance recoverable on unpaid and paid losses |  | 2,334,922 | 2,096,104 |
Insurance and reinsurance balances payable |  | 493,183 | 356,417 |
Stone Point Group [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 4,000 | 4,000 | 4,000
NXT Capital [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 1,000 | 1,000 | 1,000
NXT Capital II [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Unfunded commitments related to other investments |  | 30,000 |  |
NXT Capital III [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Unfunded commitments related to other investments |  | 30,000 |  |
Chairman [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 600 | 1,000 | $ 1,000
Significant influence [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amounts of transactions with related parties |  | 411,000 | $ 193,000 |
Harrington Re [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded premiums |  | 128,000 |  |
Ceded losses and loss expenses |  | 27,000 |  |
Reinsurance recoverable on unpaid and paid losses |  | 38,000 |  |
Insurance and reinsurance balances payable |  | 86,000 |  |
Ventures Re [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded premiums |  | 40,000 |  |
Ceded losses and loss expenses |  | $ 10,000 |  |
Scenario, Forecast [Member] | Chairman [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party | $ 500 |  |  |

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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 The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(3),(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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