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Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details) | 3 Months Ended
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Mar. 31, 2017 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Transfers, Into Level 3 | $ 0
Non-Agency [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 1,082,000
Realized gains | 1,000
Redemptions | (64,000)
Net change | (63,000)
Ending Balance | 1,019,000
Corporate Fixed Income Securities [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 273,000
Redemptions | (6,000)
Net change | (6,000)
Ending Balance | 267,000
Equity Securities [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 600,000
Unrealized gains/(losses), Included in changes in net assets | (17,000)
Net change | (17,000)
Ending Balance | 583,000
Corporate Equity Securities [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 3,833,000
Ending Balance | 3,833,000
Equity Auction Rate Securities [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 48,689,000
Unrealized gains/(losses), Included in changes in net assets | 366,000
Net change | 366,000
Ending Balance | 49,055,000
Auction Rate Municipal Securities [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 832,000
Unrealized gains/(losses), Included in changes in net assets | 5,000
Net change | 5,000
Ending Balance | 837,000
Other Investment [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning Balance | 1,240,000
Ending Balance | $ 1,240,000

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis realized asset gain loss included in earnings. + References No definition available. + 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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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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