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Acquisition of Tokio Millennium Re Acquisition of Tokio Millennium Re (Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - TMR Group Entities
$ in Thousands
Mar. 22, 2019
USD ($)
state
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]    
Goodwill $ 13,094 $ 13,100
Identifiable finite lived intangible assets (top broker relationships and renewal rights) $ 11,200  
Acquired finite-lived intangibles, weighted average amortization period 10 years 6 months  
Identifiable indefinite lived intangible assets (insurance licenses) $ 6,800  
Value of business acquired, amortization period 2 years  
Value of business acquired $ 287,600  
Deferred tax liability related to the estimated fair value of the intangible assets recorded 2,281  
Deferred tax liability related to other adjustments 2,606  
Insurance licenses    
Business Acquisition [Line Items]    
Identifiable indefinite lived intangible assets (insurance licenses) $ 6,800  
Number of states, ability to write reinsurance | state 50