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INCOME TAXES - Operating and capital loss carryforwards and tax credits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating and capital loss carryforwards	$ 80,008	$ 85,901
Singapore
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	110,504	103,899
United Kingdom
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	357,226	431,374
Tax credit	8,756	864
Ireland
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	404	9,064
Tax credit	2,386	2,092
Ireland | Capital loss carryforward
Operating Loss And Tax Credit Carryforwards [Line Items]
Capital loss carryforwards	716	716
Belgian
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	1,850	0
Lloyd's
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating and capital loss carryforwards	39,000	50,000
Lloyd's | United Kingdom
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	$ 206,000	$ 293,000

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating and capital loss carryforwards.

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