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Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Gross debt	$ 426,606	$ 425,900
Less unamortized debt issuance costs	728	914
Debt less unamortized debt issuance costs	425,878	424,986
Senior notes due 2023 | Senior Notes
Debt Instrument [Line Items]
Gross debt	$ 250,000	250,000
Stated interest rate on debt	5.30%
Contribution Certificates
Debt Instrument [Line Items]
Gross debt	$ 176,606	$ 175,900
Stated interest rate on debt	3.00%
Effective interest rate on debt	4.35%

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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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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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