Significant Accounting Policies - Annual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Organization [Line Items]
Liabilities	$ 7,480,929	$ 7,452,460
Assets	8,828,774	8,748,814
Variable Interest Entity, Primary Beneficiary
Organization [Line Items]
Liabilities	4,200	9,800
Assets	$ 289,300	$ 304,100
Telecommunication and computer equipment | Minimum
Organization [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Telecommunication and computer equipment | Maximum
Organization [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Computer software | Minimum
Organization [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer software | Maximum
Organization [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Furniture and fixtures
Organization [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Hedge Funds | Operating Company
Organization [Line Items]
Asset Management Fees, Percent Fee	2.00%
During investment period | Minimum | Operating Company
Organization [Line Items]
Asset Management Fees, Percent Fee	1.00%
During investment period | Maximum | Operating Company
Organization [Line Items]
Asset Management Fees, Percent Fee	2.00%
During investment period | Other Healthcare Royalty Partners | Minimum | Operating Company
Organization [Line Items]
Asset Management Fees, Percent Fee	0.20%
During investment period | Other Healthcare Royalty Partners | Maximum | Operating Company
Organization [Line Items]
Asset Management Fees, Percent Fee	1.00%
After investment period | Healthcare Royalty Partners | Minimum | Operating Company
Organization [Line Items]
Asset Management Fees, Percent Fee	1.00%
After investment period | Healthcare Royalty Partners | Maximum | Operating Company
Organization [Line Items]
Asset Management Fees, Percent Fee	2.00%