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Acquisition of Tokio Millennium Re (Schedule of Identifiable Intangible Assets) (Details) - TMR - USD ($)
$ in Thousands
9 Months Ended
Mar. 22, 2019
Dec. 31, 2019
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, 2019)   $ 810
Net identifiable intangible assets related to the acquisition of TMR at December 31, 2019 $ 18,000 $ 17,190
Economic Useful Life 10 years 6 months  
Insurance licenses    
Business Acquisition [Line Items]    
Intangible assets acquired $ 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