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Investments Equity Investments (Details) - Successor [Member] - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]    
Other investments $ 478,688 $ 450,307
Real Estate [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 31,518 33,303
Hedge Funds, Multi-strategy [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 48,283 53,985
Interest Rate Contract [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 278,166 261,315
Illiquid Investments [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 40,814 39,068
Insurance Linked [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 12,658 0
Equity [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 35,048 32,633
Equity investments in pooled funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 446,487 420,304
Readily determinable fair value [Member] | Interest Rate Contract [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments $ 76,750 $ 51,158