Corporate Borrowings - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 16, 2021	Dec. 31, 2019	Dec. 31, 2017	Sep. 30, 2023	Aug. 23, 2023	Jun. 01, 2023	Dec. 31, 2022	May 14, 2021	Feb. 14, 2020
Debt Instrument [Line Items]
Total indebtedness outstanding				$ 323,450			$ 236,450
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Contingent increase in borrowing capacity								$ 100,000
Credit Agreement - Revolver, 6.42% (variable rate) due 2026
Debt Instrument [Line Items]
Outstanding borrowings under credit facility								400,000	$ 300,000
Credit Agreement - Revolver, 6.42% (variable rate) due 2026 | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total indebtedness outstanding				91,000		$ 105,000	0
Remaining borrowing capacity				309,000
Convertible Senior Notes, 1.88% (fixed rate) due 2041 | Convertible Debt
Debt Instrument [Line Items]
Total indebtedness outstanding				$ 201,250			201,250
Proceeds from issuance of debt	$ 201,250
Stated interest rate	1.88%			1.88%
Note Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Term loan face value								20,000
Note Purchase Agreement | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Remaining borrowing capacity				$ 218,800
Term loan face value					$ 250,000			$ 105,000
Series A Senior Secured Notes, 3.53% (fixed rate) due 2027 | Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding				$ 12,800			15,200
Proceeds from issuance of debt			$ 20,000
Stated interest rate				3.53%
Senior Secured Notes, 3.80% (fixed rate) due 2029 | Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding				$ 18,400			$ 20,000
Proceeds from issuance of debt		$ 20,000
Stated interest rate				3.80%