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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 23, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 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 held-to-maturity investments, curent |  | $ 301,534 |  | $ 301,534 |  |  |  |
Unrealized holding loss |  | 92 |  | 92 |  | $ 117 |  |
Reserve for expected credit losses |  | 423 |  | 423 |  |  |  |
Fair value of investments in rabbi trust |  | 18,669 |  | 18,669 |  | $ 15,296 |  |
Asset impairments |  | 240 | $ 2,935 | 3,468 | $ 12,965 |  |  |
US Treasury Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Fair value held-to-maturity investments |  | 461,876 |  | 461,876 |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Fair value held-to-maturity investments |  | $ 18,000 |  | $ 18,000 |  |  |  |
Supplier [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  | 12.70% |  | 12.70% |  |  | 3.20% | 10.00%
Cash consideration |  | $ 10,000 |  | $ 10,000 |  |  | $ 2,500 | $ 7,500
Carrying value |  | $ 9,120 |  | $ 9,120 |  |  |  |
Nuro [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Shares acquired | 766 |  |  |  |  |  |  |
Cash consideration | $ 10,000 |  |  |  |  |  |  |
Maximum [Member] | US Treasury Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Investment maturity term |  |  |  | 20 months |  |  |  |

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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