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Derivative Financial Instruments (Schedule Of Fair Values Of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, Fair Value | $ 14,695 |  | $ 14,515 |
Liability Derivatives, Fair Value | 8,325 |  | 7,771 |
Derivative Financial Instruments, Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, Fair Value | 14,687 |  | 14,515 | [1]
Net unrealized gains on exchange traded futures and options contracts included in balance sheet |  |  | 3,400 |
Derivative Financial Instruments, Assets [Member] | Cash Flow Hedges [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Net unrealized gains on exchange traded futures and options contracts included in balance sheet |  |  | 100 |
Derivative Financial Instruments, Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Liability Derivatives, Fair Value | 8,325 | [2] | $ 7,771 |
Net unrealized losses on exchange traded futures and options contracts | 9,600 |  |  |
Derivative Financial Instruments, Liabilities [Member] | Cash Flow Hedges [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Net unrealized losses on exchange traded futures and options contracts | 2,500 |  |  |
Other Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Asset Derivatives, Fair Value | $ 8 |  |  |
[1] | At December 31, 2019, derivative financial instruments, as reflected on the balance sheet, includes net unrealized gains on exchange traded futures and options contracts of $3.4 million, which include $0.1 million of net unrealized gains on derivative financial instruments designated as cash flow hedging instruments.
[2] | At September 30, 2020, derivative financial instruments, as reflected on the balance sheet, includes net unrealized losses on exchange traded futures and options contracts of $9.6 million, which included $2.5 million of net unrealized losses on derivative financial instruments designated as cash flow hedging instruments.

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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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- Definition Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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