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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 23, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Aug. 06, 2020 | Apr. 16, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Investments fair value, amount less than amortized cost |  | $ 500,172,000 | $ 445,828,000 |  |  |  |
Asset impairments |  | 4,727,000 | 16,683,000 | $ 2,897,000 |  |  |
Other assets |  | 56,716,000 | 59,047,000 |  |  |  |
US Treasury Securities [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Investments |  | $ 501,288,000 | $ 445,944,000 |  |  |  |
Investment maturity term |  | 24 months | 16 months |  |  |  |
Investments maturing within one year |  | $ 260,945,000 | $ 343,616,000 |  |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Fair value held-to-maturity investments |  |  |  |  | $ 18,000,000 |  |
Promissory note |  |  |  |  | $ 18,000,000 |  |
Reserve for expected credit losses |  | $ 423,000 |  |  |  |  |
Supplier [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Ownership percentage |  | 12.70% |  |  |  |  | 10.00%
Additional investment acquired, percentage |  |  |  |  |  | 3.20% |
Cash consideration |  | $ 10,000,000 |  |  |  | $ 2,500,000 | $ 7,500,000
Other assets |  | 9,251,000 | $ 9,529,000 |  |  |  |
Nuro [Member] |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Shares acquired | 766 |  |  |  |  |  |
Cash consideration | $ 10,000,000 |  |  |  |  |  |
Recognized gain due to increase in fair value |  | $ 5,968,000 |  |  |  |  |

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