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Investments Equity Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Other investments $ 428,556 $ 391,217
Real Estate [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 16,150 16,123
Interest Rate Contract [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 207,704 177,357
Illiquid Investments [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 85,323 84,297
Insurance Linked [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 28,746 29,318
Equity [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 49,122 43,954
Equity investments in pooled funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 387,045 351,049
Readily determinable fair value [Member] | Interest Rate Contract [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments $ 53,135 $ 27,154