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INCOME TAXES - Operating and capital loss carryforwards and tax credits (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Singapore |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 103,899 | $ 79,445
United Kingdom |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | 431,374 | 413,504
Tax credit | 864 | 398
Ireland |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | 9,064 | 12,756
Tax credit | 2,092 | 2,248
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 | 0 | 15,062
U.S. alternative minimum tax credit | 0 | 6,026
Lloyd's | United Kingdom |  |
Operating Loss And Tax Credit Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 293,000 | $ 403,000

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