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Fair Value Measurements And Fair Values Of Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total liabilities | $ 40 | $ 19 |
Assets, Fair Value Disclosure | 397,331 | 187,873 |
Fair Value, Nonrecurring [Member] |  |  |
Assets, Fair Value Disclosure | $ 5,474 | $ 1,080 | [1]
[1] | Includes assets directly charged down to fair value during the year-to-date period.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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Period Type: | instant

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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