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Investments Equity Investments (Details) - Successor [Member] - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Equity Method Investments [Line Items] |  |
Other investments | $ 394,396 | $ 431,630
Real Estate [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 33,297 | 33,154
Hedge Funds, Multi-strategy [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 31,417 | 53,054
Interest Rate Contract [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 145,981 | 136,603
Illiquid Investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 67,214 | 67,787
Insurance Linked [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 22,023 | 22,666
Equity [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 56,967 | 53,675
Equity investments in pooled funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 356,899 | 366,939
Readily determinable fair value [Member] | Interest Rate Contract [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | $ 2,866 | $ 2,823

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