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Investments Equity Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Equity Method Investments [Line Items] |  |
Other investments | $ 469,438 | $ 391,217
Insurance Linked Redemption Cash Received [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 24,804 |
Real Estate [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 15,831 | 16,123
Interest Rate Contract [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 233,904 | 177,357
Illiquid Investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 38,385 | 84,297
Insurance Linked [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 27,752 | 29,318
Insurance Linked [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 24,698 |
Equity [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 50,691 | 43,954
Credit Index Product [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 60,000 |
Equity investments in pooled funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 426,563 | 351,049
Readily determinable fair value [Member] | Interest Rate Contract [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | 78,998 | $ 27,154
Commitments [Member] | Partnership Interest [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Other investments | $ 25,000 |

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