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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, 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, 2020), net of foreign exchange     $ 1,715
Impairment loss   $ 6,800  
Net identifiable intangible assets related to the acquisition of TMR at December 31, 2020 $ 18,000 9,485 $ 9,485
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