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Investments (Narrative) (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Sep. 25, 2017 USD ($)	Mar. 31, 2021 USD ($) investment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Non-cash exchange of available-for-sale debt securities			$ 18,300
Recognized loss on exchange of available-for-sale debt securities			4,400
Impairment loss related to decline in value				$ 19,600
Cumulative impairment losses		$ 23,800
Variable interest entity, amount committed to invest	$ 200,000
Variable interest entity, ownership percentage	76.60%
Annual management fee percentage	2.00%
Management fee annual reduction percentage	10.00%
Entitled carried interest percentage	20.00%
Investment period		6 years
Variable interest entity, amount of capital call notices received		$ 7,100	22,800
Variable interest entity, amount paid		8,100	22,800
Income (loss) from equity method investment		24,270	(4,269)
Tax expense			2,700
Management fees recognized		$ 800	$ 800
COVID-19
Unusual or Infrequent Item, or Both [Line Items]
Number of investments impaired | investment		2
Equity method investment, impairment		$ 7,000

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