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Commitments Contingencies and Guarantees (Commitments to Fund Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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 | $ 332,169 | $ 263,163
Commercial Loan [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 126,248 | 86,325
Bank Loan Obligations [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 58,318 | 48,686
Equity Release Mortgages [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | $ 130,324 | $ 8,504

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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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