Investments - Finance Receivable Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investments
Nonaccrual loans	$ 30,645	$ 61,705
Asset Management
Investments
Nonaccrual loans	0	0
Financing receivable, gross	13,586	13,586
Asset Management | Corporate loans
Investments
Nonaccrual loans	0	0
Financing receivable, gross	13,586	13,586
Asset Management | Loans 30-59 days past due
Investments
Financing receivable, gross	0	0
Asset Management | Loans 60-89 days past due
Investments
Financing receivable, gross	0	0
Asset Management | Loans 90 days or more past due
Investments
Financing receivable, gross	0	0
Asset Management | Current loans
Investments
Financing receivable, gross	13,586	13,586
Asset Management | Current loans | Corporate loans
Investments
Financing receivable, gross	13,586	13,586
Insurance Solutions
Investments
Nonaccrual loans	30,645	61,705
Financing receivable, gross	198,797	190,645
Insurance Solutions | Corporate loans
Investments
Financing receivable, gross	16,136	18,043
Insurance Solutions | Commercial real estate mortgage loans
Investments
Nonaccrual loans	10,475	20,642
Financing receivable, gross	70,425	65,070
Insurance Solutions | Multi-family mortgage loans
Investments
Nonaccrual loans	20,170	41,063
Financing receivable, gross	112,236	107,532
Insurance Solutions | Loans 30-59 days past due
Investments
Financing receivable, gross	0	0
Insurance Solutions | Loans 60-89 days past due
Investments
Financing receivable, gross	0	0
Insurance Solutions | Loans 90 days or more past due
Investments
Financing receivable, gross	0	0
Insurance Solutions | Current loans
Investments
Financing receivable, gross	168,152	128,940
Insurance Solutions | Current loans | Corporate loans
Investments
Financing receivable, gross	16,136	18,043
Insurance Solutions | Current loans | Commercial real estate mortgage loans
Investments
Financing receivable, gross	59,950	44,428
Insurance Solutions | Current loans | Multi-family mortgage loans
Investments
Financing receivable, gross	$ 92,066	$ 66,469