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Fair Value of Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of investments in rabbi trust | $ 19,876,000 |  | $ 19,876,000 |  | $ 19,330,000 |
Asset impairments | 367,000 | $ 519,000 | 1,098,000 | $ 3,228,000 |  |
Long-term investments | 359,911,000 |  | 359,911,000 |  | 274,311,000 |
Other assets | 63,010,000 |  | 63,010,000 |  | 56,716,000 |
US Treasury Securities [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Investments | 555,880,000 |  | 555,880,000 |  | 501,288,000 |
Investments maturing within one year | 240,684,000 |  | 240,684,000 |  | 260,945,000 |
Fair value held-to-maturity investments | 546,525,000 |  | 546,525,000 |  | 500,172,000 |
Corporate Debt Securities [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value held-to-maturity investments | 17,000,000 |  | 17,000,000 |  | 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 |
Maximum [Member] | US Treasury Securities [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Investment maturity term |  |  | 28 months |  | 24 months |
Nuro [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Shares acquired | 766 |  | 766 |  |  |
Recognized gain |  |  | $ 5,968,000 |  |  |
Long-term investments | $ 15,968,000 |  | $ 15,968,000 |  | $ 15,968,000 |
Tractor [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Shares acquired | 4,325 |  | 4,325 |  |  |
Recognized gain | $ 3,305,000 |  | $ 3,305,000 |  |  |
Ownership percentage | 10.30% |  | 10.30% |  |  |
Cash consideration | $ 10,000,000 |  | $ 10,000,000 |  |  |
Equity method investment, impairment |  |  | 0 | $ 0 |  |
Carrying value | 12,511,000 |  | 12,511,000 |  | $ 9,251,000 |
Tractor Warrants [Member] |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Recognized gain | $ 7,105,000 |  | $ 7,105,000 |  |  |
Number of shares that may be called by warrants | 3,772 |  | 3,772 |  |  |
Carrying value | $ 10,747,000 |  | $ 10,747,000 |  |  |

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