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Commitments, Contingencies and Guarantees (Guarantees Issued) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Insurance Treaty Guarantee [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | $ 936,032 | $ 902,216
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 810,870 | 780,786
Guarantee Of Borrowed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 295,285 | 263,820
Product Financing Arrangement [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 100,602 | 119,073
Guarantee Of Lease Obligations [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | $ 1,895 | $ 2,428

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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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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