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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.

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Amount of written premiums ceded to other entities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
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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).

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

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The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.

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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.

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