Significant Accounting Policies All Other - Quarterly (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Assets	$ 8,426,027	$ 8,748,814
Liabilities	7,094,554	7,452,460
Variable Interest Entity, Primary Beneficiary [Member]
Assets	332,400	304,100
Liabilities	$ 6,600	$ 9,800
Operating Company | Hedge Funds
Asset Management Fees, Percent Fee	2.00%
Operating Company | During investment period | Minimum
Asset Management Fees, Percent Fee	1.00%
Operating Company | During investment period | Maximum
Asset Management Fees, Percent Fee	2.00%
Operating Company | During investment period | Other Healthcare Royalty Partners | Minimum
Asset Management Fees, Percent Fee	0.20%
Operating Company | During investment period | Other Healthcare Royalty Partners | Maximum
Asset Management Fees, Percent Fee	1.00%
Operating Company | After investment period | Healthcare Royalty Partners | Minimum
Asset Management Fees, Percent Fee	1.00%
Operating Company | After investment period | Healthcare Royalty Partners | Maximum
Asset Management Fees, Percent Fee	2.00%