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INCOME TAXES - Effective tax rate (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of effective tax rate (% of income before income taxes) [Line Items]      
Unrecognized tax benefits $ 0 $ 0  
Income (loss) before income taxes      
Bermuda (domestic) 431,310,000 (45,951,000) $ 179,418,000
Foreign 249,686,000 (86,794,000) 167,747,000
 Total income (loss) before income taxes $ 680,996,000 $ (132,745,000) $ 347,165,000
Reconciliation of effective tax rate (% of income before income taxes)      
Expected tax rate 0.00% 0.00% 0.00%
Valuation allowance (0.50%) (1.70%) 1.30%
Other 1.40% (2.10%) (3.00%)
Actual tax rate 9.20% 9.30% 6.80%
U.S.      
Reconciliation of effective tax rate (% of income before income taxes)      
Foreign taxes at local expected rates 4.80% 5.60% 8.10%
Europe      
Reconciliation of effective tax rate (% of income before income taxes)      
Foreign taxes at local expected rates 2.00% 9.20% 0.40%
Change in enacted tax rate 1.50% (1.70%) 0.00%
United Kingdom | Minimum      
Reconciliation of effective tax rate (% of income before income taxes)      
Change in enacted tax rate 19.00% 17.00%  
United Kingdom | Maximum      
Reconciliation of effective tax rate (% of income before income taxes)      
Change in enacted tax rate 25.00% 19.00%  
Belgium | Minimum      
Reconciliation of effective tax rate (% of income before income taxes)      
Change in enacted tax rate 29.58%    
Belgium | Maximum      
Reconciliation of effective tax rate (% of income before income taxes)      
Change in enacted tax rate 25.00%