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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

X

- Definition

Percentage of NXT Capital's ordinary shares outstanding held by Stone Point Capital.

+ References

No definition available.

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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

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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
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Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

+ References

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-Name Accounting Standards Codification
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-SubTopic 20
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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