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Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Gross debt	$ 428,910	$ 427,525
Less unamortized debt issuance costs	2,331	542
Debt less unamortized debt issuance costs	$ 426,579	426,983
Senior notes due 2023 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate on debt	5.30%
Gross debt	$ 250,000	250,000
Contribution Certificates
Debt Instrument [Line Items]
Stated interest rate on debt	3.00%
Effective interest rate on debt	4.35%
Gross debt	$ 178,910	$ 177,525

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