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RELATED PARTY TRANSACTIONS (DETAILS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |  |  |
Unfunded commitments related to other investments |  | $ 379,000 | $ 123,000 |
Percentage ownership by related parties |  | 45.00% |  |
Ceded premiums |  | $ 929,064 | 804,544 | $ 768,841
Ceded losses and loss expenses |  | 577,000 | 401,000 | 415,000
Stone Point Group [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 4,000 | 4,000 | 2,000
NXT Capital [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party |  | 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 |  | 1,000 | 1,000 | $ 1,000
Chairman [Member] | Subsequent Event [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Fees paid to related party | $ 1,000 |  |  |
Significant influence [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amounts of transactions with related parties |  | 193,000 | $ 366,000 |
Ventures Re [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded premiums |  | 19,000 |  |
Ceded losses and loss expenses |  | $ 23,000 |  |

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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 (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 + 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=36462937&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 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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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: 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 + Details
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