Corporate Borrowings - Indebtedness Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Nov. 16, 2021
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 237,250	$ 239,853
Less unamortized loan fees	(6,199)	(6,454)
Total indebtedness outstanding, net	231,051	233,399
Less current maturities of long-term debt	(4,800)	(3,227)
Long-term debt and Credit Agreement - Revolver	226,251	230,172
Other long-term borrowings
Debt Instrument [Line Items]
Total indebtedness outstanding	0	203
Credit Agreement - Revolver, 4.14% (variable rate) due 2025 \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 0	0
Credit agreement, interest rate	4.14%
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%		1.875%
Series A Senior Secured Notes, 3.53% (fixed rate) due 2027 \| Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 16,000	18,400
Stated interest rate	3.53%
Senior Secured Notes, 3.80% (fixed rate) due 2029 \| Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 20,000	$ 20,000
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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