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INCOME TAX - Change in Valuation Allowance (Details) - USD ($)
$ in Thousands
 7 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
May 31, 2016
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, beginning of period $ (15,119) $ (16,550) $ (16,611) $ (3,823)
Valuation allowance, end of period (16,611) (23,390) (16,550) (15,119)
Net operating loss carryforwards        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change (1,504) 1,145 (3,793) (4,474)
Net operating loss carryforwards | Foreign Tax Authority        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change   (7,979) (6,469)  
Income tax credit carryforward | Foreign Tax Authority        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change     7,140 (7,140)
Income tax credit carryforward | State Tax Authority        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change   $ (6) (685)  
Net unrealized capital loss        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change $ 12     (1,526)
Capital loss carryforward        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change       1,746
Rate change        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change     $ 3,868  
Other        
Movement in Deferred Tax Valuation Allowance [Roll Forward]        
Valuation allowance, change       $ 98