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INCOME TAXES - Effective tax rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of effective tax rate (% of income before income taxes) [Line Items]
Unrecognized tax benefits	$ 0	$ 0
Income (loss) before income taxes
Bermuda (domestic)	(45,951,000)	179,418,000	$ 181,597,000
Foreign	(86,794,000)	167,747,000	(168,062,000)
Total income (loss) before income taxes	$ (132,745,000)	$ 347,165,000	$ 13,535,000
Reconciliation of effective tax rate (% of income before income taxes)
Expected tax rate	0.00%	0.00%	0.00%
Valuation allowance	(1.70%)	1.30%	(13.40%)
Net tax exempt income	0.00%	0.00%	(3.30%)
Other	(2.10%)	(3.00%)	5.90%
Actual tax rate	9.30%	6.80%	(217.90%)
U.S.
Reconciliation of effective tax rate (% of income before income taxes)
Foreign taxes at local expected rates	5.60%	8.10%	65.70%
Europe
Reconciliation of effective tax rate (% of income before income taxes)
Foreign taxes at local expected rates	9.20%	0.40%	(289.70%)
Change in enacted tax rate	(1.70%)	0.00%	16.90%

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