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INCOME TAXES - Effective tax rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of effective tax rate (% of income before income taxes) [Line Items]
Unrecognized tax benefits	$ 0	$ 0
Income (loss) before income taxes
Bermuda (domestic)	179,418,000	181,597,000	$ (188,420,000)
Foreign	167,747,000	(168,062,000)	(188,091,000)
Total income (loss) before income taxes	$ 347,165,000	$ 13,535,000	$ (376,511,000)
Reconciliation of effective tax rate (% of income before income taxes)
Expected tax rate	0.00%	0.00%	0.00%
Valuation allowance	1.30%	(13.40%)	0.00%
Net tax exempt income	0.00%	(3.30%)	0.10%
Other	(3.00%)	5.90%	0.30%
Actual tax rate	6.80%	(217.90%)	2.00%
U.S.
Reconciliation of effective tax rate (% of income before income taxes)
Foreign taxes at local expected rates	8.10%	65.70%	6.60%
Change in enacted tax rate	0.00%	0.00%	(11.10%)
Europe
Reconciliation of effective tax rate (% of income before income taxes)
Foreign taxes at local expected rates	0.40%	(289.70%)	5.80%
Change in enacted tax rate	0.00%	16.90%	0.00%
Other
Reconciliation of effective tax rate (% of income before income taxes)
Foreign taxes at local expected rates	0.00%	0.00%	0.30%

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