Segment Information - Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Mark-to-market (loss) gain on public equity securities	$ 200	$ (17,800)	$ (4,800)	$ (27,200)
(Loss) gain in fair value of public equity securities	186	(17,780)	(4,836)	(60,939)
Other income, net
Segment Reporting Information [Line Items]
Mark-to-market (loss) gain on public equity securities		17,800		(27,200)
(Loss) gain in fair value of public equity securities	(38,000)		(38,000)	(33,700)
Gain (loss) on sale of assets				17,300
Preferred equity gain	10,100	8,900	19,800	17,600
Liability releases		600		600
Charges for asset retirement obligations			1,900	2,900
Gain (loss) from adjustment of indemnification related to previously disposed businesses			(1,900)	(2,400)
Selling, general and administrative expenses
Segment Reporting Information [Line Items]
Gain (loss) on sale of assets	8,300		11,400
Severance expenses	$ 1,800		1,800
Legal costs		$ 5,100	$ 600	5,200
Cost of goods sold
Segment Reporting Information [Line Items]
Non-routine labor costs				$ 1,400
Windfield
Segment Reporting Information [Line Items]
Ownership percentage	49.00%		49.00%