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INCOME TAXES - Operating and capital loss carryforwards and tax credits (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Singapore |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 79,445 | $ 77,467
United Kingdom |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | 413,504 | 126,839
Tax credit | 398 | 14,310
Ireland |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | 12,756 | 0
Tax credit | 2,248 | 3,566
Ireland | Capital loss carryforward |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Capital loss carryforwards | 716 | 716
U.S. |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | 15,062 | 115,236
U.S. alternative minimum tax credit | 6,026 | 12,052
Lloyd's | United Kingdom |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 403,000 | $ 113,000

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