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INCOME TAXES - Effective tax rate (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of effective tax rate (% of income before income taxes) [Line Items] |  |  |
Unrecognized tax benefits | $ 0 | $ 0 |
Income (loss) before income taxes |  |  |
Bermuda (domestic) | 181,597,000 | (188,420,000) | $ 469,306,000
Foreign | (168,062,000) | (188,091,000) | 50,402,000
Total income before income taxes | $ 13,535,000 | $ (376,511,000) | $ 519,708,000
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Expected tax rate | 0.00% | 0.00% | 0.00%
Valuation allowance | (13.40%) | 0.00% | 0.20%
Net tax exempt income | (3.30%) | 0.10% | (0.20%)
Other | 5.90% | 0.30% | 0.30%
Actual tax rate | (217.90%) | 2.00% | 1.20%
U.S. |  |  |
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Foreign taxes at local expected rates: | 65.70% | 6.60% | (0.60%)
Change in enacted tax rate | 0.00% | (11.10%) | 0.00%
Europe |  |  |
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Foreign taxes at local expected rates: | (289.70%) | 5.80% | 1.50%
Change in enacted tax rate | 16.90% | 0.00% | 0.00%
Other |  |  |
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Foreign taxes at local expected rates: | 0.00% | 0.30% | 0.00%
Foreign Tax Credit And Change In Investment Related Items |  |  |
Reconciliation of effective tax rate (% of income before income taxes) [Line Items] |  |  |
Change in valuation allowance | $ (1,200,000) |  |

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