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Taxation (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]      
Increase (decrease) in valuation allowance $ 42,800,000 $ 13,000,000 $ 40,400,000
Income taxes paid (refunded) (4,261,000) 5,668,000 $ 9,749,000
Unrecognized tax benefits 0 0  
Interest and penalties accrued on unrecognized tax benefits $ 0 $ 0  
Bermuda      
Operating Loss Carryforwards [Line Items]      
Statutory income tax rate 0.00%    
Singapore      
Operating Loss Carryforwards [Line Items]      
Foreign statutory income tax rate 17.00%    
Operating loss carryforwards $ 13,600,000    
Ireland      
Operating Loss Carryforwards [Line Items]      
Foreign statutory income tax rate 12.50%    
Operating loss carryforwards $ 6,500,000    
U.S.      
Operating Loss Carryforwards [Line Items]      
Expected tax rate 5.00%    
Foreign statutory income tax rate 21.00%    
Operating loss carryforwards $ 333,700,000    
Australia      
Operating Loss Carryforwards [Line Items]      
Foreign statutory income tax rate 30.00%    
Operating loss carryforwards $ 1,300,000    
Switzerland      
Operating Loss Carryforwards [Line Items]      
Foreign statutory income tax rate 19.70%    
Operating loss carryforwards $ 476,200,000    
U.K.      
Operating Loss Carryforwards [Line Items]      
Foreign statutory income tax rate 19.00%    
Operating loss carryforwards $ 142,200,000