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Related Party Transactions - Monument (Details)
$ in Thousands, € in Millions
12 Months Ended 39 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
May 31, 2019
USD ($)
May 31, 2019
EUR (€)
Aug. 29, 2017
USD ($)
Aug. 29, 2017
EUR (€)
Related Party Transaction [Line Items]                
Investment in common and preferred shares $ 69,213 $ 155,440 $ 0          
Ownership percentage 47.40% 47.40%   47.40%        
Loss on sale of subsidiary $ 0 $ 0 16,349          
Cumulative CTA adjustment 0 0 (20,751)          
Policy benefits for life contracts   105,100            
Equity method investments $ 326,277 $ 204,507   $ 326,277        
Laguna | Not discontinued operations, disposed of by sale                
Related Party Transaction [Line Items]                
Loss on sale of subsidiary     16,300          
Cumulative CTA adjustment     $ (6,300)          
Monument | Laguna | Not discontinued operations, disposed of by sale | Affiliated entity                
Related Party Transaction [Line Items]                
Consideration received             $ 30,800 € 25.6
Monument                
Related Party Transaction [Line Items]                
Investment in common and preferred shares       $ 26,600        
Ownership percentage 26.60% 26.60%   26.60%        
Equity method investments $ 60,598 $ 42,193   $ 60,598        
Transfer Of Life Assurance Policies | Subsidiary of Monument                
Related Party Transaction [Line Items]                
Policy benefits for life contracts         $ 99,100 € 88.8    
Assets related to future policy benefits         $ (101,600) € (91.1)