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Commitments, Contingencies and Guarantees (Commitments to Fund Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Limited Partner [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | $ 482,149 | $ 485,197
Commercial Loan [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 67,837 | 40,815
Bank Loans [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 96,808 | 60,472
Equity Release Mortgages [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | $ 132,523 | $ 153,937

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