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Acquisition of Tokio Millennium Re (Schedule of Identifiable Intangible Assets) (Details) - TMR - USD ($)
$ in Thousands
 12 Months Ended 21 Months Ended
Mar. 22, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2020
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]        
Accumulated amortization (from March 22, 2019 through December 31, 2021), net of foreign exchange       $ 2,851
Impairment loss   $ 6,800    
Net identifiable intangible assets related to the acquisition of TMR at December 31, 2021 $ 18,000 $ 8,349    
Economic Useful Life 10 years 6 months      
Insurance licenses        
Business Acquisition [Line Items]        
Intangible assets acquired $ 6,800      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]        
Impairment loss     $ 6,800  
Top broker relationships        
Business Acquisition [Line Items]        
Identifiable finite lived intangible assets (top broker relationships and renewal rights) $ 10,000      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]        
Economic Useful Life 10 years      
Renewal rights        
Business Acquisition [Line Items]        
Identifiable finite lived intangible assets (top broker relationships and renewal rights) $ 1,200      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]        
Economic Useful Life 15 years