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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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