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Equity Investments (Narrative) (Details) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 8,376,000		$ 8,896,000
Long-term investments	$ 776,815,000		564,488,000
Tractor
Schedule of Equity Method Investments [Line Items]
Investment shares owned (in shares)	4,325
Ownership percentage	10.20%
Cash consideration	$ 10,000,000
Equity method investment, impairment	0	$ 0
Carrying value	$ 8,376,000		8,896,000
Tractor Warrants
Schedule of Equity Method Investments [Line Items]
Number of shares that may be called by warrants (in shares)	2,162
Long-term investments	$ 8,675,000		8,675,000
Nuro
Schedule of Equity Method Investments [Line Items]
Investment shares owned (in shares)	766
Long-term investments	$ 15,968,000		15,968,000
Recognized gain	5,968,000	$ 5,968,000
Cultivate Fund
Schedule of Equity Method Investments [Line Items]
Long-term investments	$ 22,221,000		$ 21,221,000

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