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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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