INCOME TAXES - Summary of Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income (loss) before income taxes
Bermuda (domestic)	$ 213,539	$ 236,781	$ 431,310
Foreign	189,067	8,340	249,686
Total income before income taxes	$ 402,606	$ 245,121	$ 680,996
Reconciliation of effective tax rate (% of income before income taxes)
Expected tax rate	0.00%	0.00%	0.00%
Valuation allowance	(2.00%)	9.50%	(0.50%)
Prior year adjustments	1.30%	(0.30%)	0.20%
Incremental branch taxes	0.90%	(0.40%)	1.50%
Other	0.20%	0.30%	(0.30%)
Actual tax rate	6.50%	9.00%	9.20%
U.S.
Reconciliation of effective tax rate (% of income before income taxes)
Foreign taxes at local expected rates	(2.50%)	0.20%	4.80%
Europe
Reconciliation of effective tax rate (% of income before income taxes)
Foreign taxes at local expected rates	11.90%	1.90%	2.00%
Change in enacted tax rate	(3.30%)	(2.20%)	1.50%
United Kingdom
Reconciliation of effective tax rate (% of income before income taxes)
Expected tax rate			25.00%	19.00%
Belgium
Reconciliation of effective tax rate (% of income before income taxes)
Expected tax rate			25.00%	30.00%

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