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INCOME TAXES - Operating and capital loss carryforwards and tax credits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Singapore
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	$ 77,467	$ 83,532
Australia
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	0	147,193
Australia | Capital loss carryforward
Operating Loss And Tax Credit Carryforwards [Line Items]
Capital loss carryforwards	0	4,207
United Kingdom
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	126,839	19,306
Tax credit	14,310	0
United Kingdom | Novae
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	23,000
Tax credit	14,800
Ireland
Operating Loss And Tax Credit Carryforwards [Line Items]
Tax credit	3,566	3,298
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	115,236	14,221
U.S. alternative minimum tax credit	$ 12,052	$ 6,840

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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