Convertible Senior Notes - Expenses and Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
6.0% Convertible Debenture
Convertible Senior Notes
Interest expense	$ 1,596
Amortization of discount (premium)	613
Interest and Debt Expense, Total	$ 2,209
Effective interest rate (as a percent)	8.70%
3.75% Convertible Senior Notes
Convertible Senior Notes
Interest expense	$ 3,335	$ 7,546	$ 7,398
Amortization of debt issuance costs	642	1,345	1,286
Interest and Debt Expense, Total	$ 3,977	$ 8,891	$ 8,684
Effective interest rate (as a percent)	4.50%	4.60%	4.50%
7.0% Convertible Senior Notes
Convertible Senior Notes
Interest expense	$ 7,687
Amortization of discount (premium)	(4,085)
Interest and Debt Expense, Total	$ 3,602
Effective interest rate (as a percent)	3.00%