Corporate Borrowings - Indebtedness Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Nov. 16, 2021
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 307,250	$ 293,850
Less unamortized loan fees	(6,427)	(6,601)
Total indebtedness outstanding, net	300,823	287,249
Less current maturities of long-term debt	(6,400)	(6,400)
Long-term debt	294,423	280,849
Credit Agreement - Revolver, 6.43% (variable rate) due 2026 \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 78,000	63,000
Credit agreement, interest rate	6.43%
Convertible Senior Notes, 1.88% (fixed rate) due 2041 \| Convertible Debt
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 201,250	201,250
Stated interest rate	1.88%		1.88%
Series A Senior Secured Notes, 3.53% (fixed rate) due 2027 \| Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 11,200	12,000
Stated interest rate	3.53%
Senior Secured Notes, 3.80% (fixed rate) due 2029 \| Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 16,800	$ 17,600
Stated interest rate	3.80%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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