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v3.22.2.2

Fair Value of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Long-term Investments | $ 442,620,000 |  | $ 442,620,000 |  | $ 274,311,000
Fair value of investments in rabbi trust | 19,834,000 |  | 19,834,000 |  | 19,330,000
Asset impairments | 698,000 | $ 240,000 | 1,796,000 | $ 3,468,000 |
Other assets | 63,798,000 |  | 63,798,000 |  | 56,716,000
Notes Receivable [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Note receivable | $ 5,000,000 |  | $ 5,000,000 |  |
Note receivable, interest rate | 6.00% |  | 6.00% |  |
Note receivable, maturity | Jul. 18, 2024 |  | Jul. 18, 2024 |  |
Long-term Investments | $ 5,000,000 |  | $ 5,000,000 |  |
US Treasury Securities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Investments | 808,183,000 |  | 808,183,000 |  | 501,288,000
Investments maturing within one year | 417,278,000 |  | 417,278,000 |  | 260,945,000
Fair value held-to-maturity investments | 792,285,000 |  | 792,285,000 |  | 500,172,000
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value held-to-maturity investments | 17,300,000 | $ 18,000,000 | 17,300,000 | 18,000,000 | 18,000,000
Promissory note | 18,000,000 |  | 18,000,000 |  |
Reserve for expected credit losses | $ 216,000 |  | $ 216,000 |  | $ 423,000
Note receivable, maturity | Sep. 30, 2028 |  | Sep. 30, 2028 |  |
Maximum [Member] | US Treasury Securities [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Investment maturity term |  |  | 25 months |  | 24 months
Nuro [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Long-term Investments | $ 15,968,000 |  | $ 15,968,000 |  | $ 15,968,000
Shares acquired | 766 |  | 766 |  |
Recognized gain |  |  | $ 5,968,000 |  |
Tractor [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Shares acquired | 4,325 |  | 4,325 |  |
Ownership percentage | 10.30% |  | 10.30% |  |
Cash consideration | $ 10,000,000 |  | $ 10,000,000 |  |
Equity method investment, impairment |  |  | 0 | $ 0 |
Carrying value | $ 12,325,000 |  | $ 12,325,000 |  | $ 9,251,000
Tractor Warrants [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Number of shares that may be called by warrants | 3,772 |  | 3,772 |  |
Carrying value | $ 10,747,000 |  | $ 10,747,000 |  |
Cultivate Fund [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Carrying value | $ 2,000,000 |  | $ 2,000,000 |  |

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