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Investments Equity Investments (Details) - Successor [Member] - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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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

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- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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