CORPORATE BORROWINGS - Indebtedness Outstanding Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 01, 2023	Dec. 31, 2022	Nov. 16, 2021	Apr. 30, 2019	Dec. 31, 2017
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 293,850		$ 236,450
Less unamortized loan fees	(6,601)		(6,115)
Total indebtedness outstanding, net	287,249		230,335
Less current maturities of long-term debt	(6,400)		(5,600)
Long-term debt	$ 280,849		224,735
Credit Agreement | Revolver
Debt Instrument [Line Items]
Credit Agreement, interest rate	6.46%
Credit Agreement | Revolver | Credit Agreement - Revolver, 6.46% (variable rate) due 2026
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 63,000	$ 105,000	0
Credit Agreement, interest rate	6.46%
Convertible Debt | Convertible Note, 1.88% (fixed rate) due 2041
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 201,250		201,250
Less unamortized loan fees	$ (5,706)
Senior secured notes, stated interest rate	1.88%			1.88%
Secured Debt | Series A Senior Secured Notes, 3.53% (fixed rate) due 2027
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 12,000		15,200
Senior secured notes, stated interest rate	3.53%					3.53%
Secured Debt | Senior Secured Notes, 3.80% (fixed rate) due 2029
Debt Instrument [Line Items]
Total indebtedness outstanding	$ 17,600		$ 20,000
Senior secured notes, stated interest rate					3.80%