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Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investments [Member] |  |
Assets |  |
Total assets, fair value | $ 3,904,064 | $ 3,732,728
Financing Receivable [Member] |  |
Assets |  |
Total assets, fair value | 5,514 | 5,565
Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Liabilities, fair value | 1,550 | 1,323
Fair Value, Measurements, Recurring [Member] | Call Option [Member] |  |
Liabilities |  |
Liabilities, fair value | 589 | 123
Fair Value, Measurements, Recurring [Member] | Total Return Swap [Member] |  |
Liabilities |  |
Liabilities, fair value | 961 | 1,200
Fair Value, Measurements, Recurring [Member] | Borrowings [Member] | Unsecured debt [Member] |  |
Liabilities |  |
Liabilities, fair value | $ 361,118 | $ 385,583

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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