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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 23, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Aug. 06, 2020 | Apr. 16, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Investment maturity term |  | 1 year |  |  |  |
Fair value of investments |  | $ 363,585 |  |  |  |
Investments fair value, amount less than amortized cost |  | 94 |  | $ 117 |  |
Fair value of investments in rabbi trust |  | 17,505 |  | $ 15,296 |  |
Asset impairments |  | $ 2,709 | $ 7,650 |  |  |
Supplier [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Ownership percentage |  | 12.70% |  |  | 3.20% | 10.00%
Cash consideration |  | $ 10,000 |  |  | $ 2,500 | $ 7,500
Carrying value |  | $ 9,202 |  |  |  |
Nuro [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Shares acquired | 766 |  |  |  |  |
Cash consideration | $ 10,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Investment maturity term |  | 17 months |  |  |  |

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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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