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Acquisition of Tokio Millennium RE (Identifiable Intangible Assets) (Details) - TMR Group Entities - USD ($)
$ in Thousands
3 Months Ended
Mar. 22, 2019
Jun. 30, 2019
Business Acquisition [Line Items]    
Identifiable finite lived intangible assets (top broker relationships and renewal rights) $ 11,200  
Intangible assets acquired 6,800  
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]    
Accumulated amortization (from March 22, 2019 through June 30, 2019)   $ 270
Net identifiable intangible assets related to the acquisition of the TMR Group Entities at June 30, 2019 $ 18,000 $ 17,730
Economic Useful Life 10 years 6 months  
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  
Insurance licenses    
Business Acquisition [Line Items]    
Intangible assets acquired $ 6,800