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Investments (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Sep. 25, 2017	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Apr. 12, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Shares issued in debt-for-equity exchange		2,300,000
Convertible securities, fair value							$ 138,300
Cash tender offer (maximum)		$ 90,000
Loss on investments, net		$ 48,243	$ 16,677	$ 48,243	$ 16,677
Shares held		1,700,000		1,700,000
Unrealized gain		$ (27,300)		$ (18,400)
Unrealized loss on short-term investments		(27,317)	0	(18,366)	0
Impairment loss on equity securities			16,700
Fair Value		15,000		15,000
Variable interest entity, amount committed to invest	$ 200,000
Equity Method Investment, Ownership Percentage	76.60%
Annual management fee percentage	2.00%
Entitled carried interest percentage	20.00%
Investment period	6 years
Equity securities		113,460		113,460				$ 122,593
Variable interest entity, amount of capital call notices received					11,100
Variable interest entity, amount paid					10,100
Distribution from equity method investment				0	0
Income (loss) from equity method investment		(6,101)	(5,751)	(6,886)	18,519
Management fees recognized		800	$ 800	1,500	$ 1,500
Investment in corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, coupon rate						4.00%
Fair Value		$ 15,000		$ 15,000
Ownership interest						3.00%
Fund
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 128,800

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