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Investments Equity Investments (Details) - Successor [Member] - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Equity Method Investments [Line Items] |  |
Other investments | $ 452,032 | $ 450,307
Real Estate [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 33,218 | 33,303
Hedge Funds, Multi-strategy [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 49,292 | 53,985
Interest Rate Contract [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 223,364 | 261,315
Illiquid Investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 63,027 | 39,068
Insurance Linked [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 13,224 | 0
Equity [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 36,489 | 32,633
Equity investments in pooled funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 418,614 | 420,304
Readily determinable fair value [Member] | Interest Rate Contract [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | $ 52,264 | $ 51,158

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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