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INCOME TAXES - Effective tax rate (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of effective tax rate (% of income before income taxes) [Line Items] |  |  |
Unrecognized tax benefits | $ 0 | $ 0 |
Income (loss) before income taxes |  |  |
Bermuda (domestic) | (188,420,000) | 469,306,000 | $ 652,235,000
Foreign | (188,091,000) | 50,402,000 | (7,576,000)
Total income before income taxes | $ (376,511,000) | $ 519,708,000 | $ 644,659,000
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Expected tax rate | 0.00% | 0.00% | 0.00%
Valuation allowance | 0.00% | 0.20% | 1.20%
Net tax exempt income | 0.10% | (0.20%) | (0.10%)
Change in U.S. enacted tax rate | (11.10%) | 0.00% | 0.00%
Other | 0.30% | 0.30% | (0.90%)
Actual tax rate | 2.00% | 1.20% | 0.50%
U.S. |  |  |
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Foreign taxes at local expected rates: | 6.60% | (0.60%) | 0.80%
Europe |  |  |
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Foreign taxes at local expected rates: | 5.80% | 1.50% | (0.20%)
Other |  |  |
Reconciliation of effective tax rate (% of income before income taxes) |  |  |
Foreign taxes at local expected rates: | 0.30% | 0.00% | (0.30%)

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