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Income Taxes - Operating loss carryfowards and tax credits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
U.K. foreign tax credits $ 19,160 $ 9,521
U.S. refundable AMT credits 0 $ 1,323
United Kingdom    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 237,277  
U.K. foreign tax credits 19,160  
Ireland    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 11,336  
Australia    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 37,995  
Hong Kong    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 21,094  
Denmark    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 23  
United States    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards [1] 27,425  
U.S. refundable AMT credits 0  
Operating loss carryforward, portion subject to utilization limits 8,300  
Operating loss carryforward, annual utilization limit $ 600  
[1] On January 30, 2014, the Company’s U.S. mortgage operations underwent an ownership change for U.S. federal income tax purposes as a result of the Company’s acquisition of the CMG Entities. As a result of this ownership change, a limitation has been imposed upon the utilization of approximately $8.3 million of the Company’s existing U.S. net operating loss carryforwards. Utilization is limited to approximately $0.6 million per year in accordance with Section 382 of the Internal Revenue Code of 1986 as amended (“the Code”).