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Investments - Limited Partnerships and Limited Liability Company Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investments    
Limited partnerships and limited liability companies (fair value) $ 66,660 $ 53,432
Threshold notice period to withdraw funds 90 days  
Minimum holding period 1 year  
PIMCO Tactical Opportunities Fund    
Investments    
Limited partnerships and limited liability companies (fair value) $ 36,600