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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Jul. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Other investments		$ 770,923	$ 787,787
Ceded premiums		2,409,243	2,251,103	$ 1,529,130
Ceded losses and loss expenses		1,602,000	1,565,000	1,010,000
Insurance and reinsurance balances payable		1,349,082	1,338,991
Stone Point Group
Related Party Transaction [Line Items]
Fees paid to related party		3,000	2,000	2,000
NXT Capital II
Related Party Transaction [Line Items]
Other investments		11,000
NXT Capital III
Related Party Transaction [Line Items]
Other investments		19,000
NXT Capital
Related Party Transaction [Line Items]
Fees paid to related party			1,000	1,000
Freedom Consumer Credit Fund, LLC Series B
Related Party Transaction [Line Items]
Fees paid to related party		3,000	2,000	1,000
Other investments		52,000
Stone Point Trident Fund VIII
Related Party Transaction [Line Items]
Other investments		71,000
Chairman
Related Party Transaction [Line Items]
Fees paid to related party		400	500	500
Significant influence
Related Party Transaction [Line Items]
Other investments		410,000	450,000
Harrington Re
Related Party Transaction [Line Items]
Ceded premiums		247,000	194,000	213,000
Ceded losses and loss expenses		157,000	142,000	119,000
Reinsurance recoverable on unpaid and paid losses		518,000	363,000
Insurance and reinsurance balances payable		159,000	115,000
Ventures Re
Related Party Transaction [Line Items]
Ceded premiums		192,000	182,000	107,000
Ceded losses and loss expenses		140,000	138,000	$ 126,000
Reinsurance recoverable on unpaid and paid losses		199,000	186,000
Insurance and reinsurance balances payable		$ 46,000	$ 67,000
Stone Point Group | NXT Capital
Related Party Transaction [Line Items]
Percentage ownership by related parties	43.00%
Stone Point Group | Pantheon
Related Party Transaction [Line Items]
Percentage ownership by related parties		14.50%

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

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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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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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