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Equity Investments (Narrative) (Details) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 11,122,000		$ 11,697,000
Long-term investments	$ 368,023,000		388,055,000
Tractor [Member]
Schedule of Equity Method Investments [Line Items]
Shares acquired	4,325
Ownership percentage	10.30%
Cash consideration	$ 10,000,000
Equity method investment, impairment	0	$ 0
Carrying value	11,122,000		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]
Shares acquired	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	$ 6,132,000		$ 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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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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