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Commitments, Contingencies and Guarantees (Guarantees Issued) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Insurance Treaty Guarantee [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | $ 949,443 | $ 1,047,449
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 832,487 | 926,393
Guarantee Of Borrowed Securities [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 291,325 | 294,325
Product Financing Arrangement [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 77,858 | 86,183
Guarantee Of Lease Obligations [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Current Carrying Value | $ 1,465 | $ 1,662

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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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