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Equity Investments (Narrative) (Details) - USD ($) shares in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 9,717,000		$ 11,697,000
Long-term investments	$ 473,247,000		388,055,000
Tractor [Member]
Schedule of Equity Method Investments [Line Items]
Investment shares owned	4,325
Ownership percentage	10.20%
Cash consideration	$ 10,000,000
Equity method investment, impairment	0	$ 0
Carrying value	9,717,000		11,697,000
Tractor Warrants [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 10,747,000		10,747,000
Number of shares that may be called by warrants	3,772
Nuro [Member]
Schedule of Equity Method Investments [Line Items]
Investment shares owned	766
Recognized gain	$ 5,968,000
Long-term investments	15,968,000		15,968,000
Cultivate Fund [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 13,696,000		$ 6,140,000

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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