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Financial Instruments and Risk Management - Carrying Value of Assets and Liabilities Recorded at Fair Value on Recurring Basis (Details) - Fair Value - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Liabilities: |  |
Liabilities | $ 15,273 | $ 15,135
Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | 15,273 | 15,135
Level 1 |  |
Liabilities: |  |
Liabilities | 15,273 | 15,135
Level 1 | Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | 15,273 | 15,135
Level 2 |  |
Liabilities: |  |
Liabilities | 0 | 0
Level 2 | Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | 0 | 0
Level 3 |  |
Liabilities: |  |
Liabilities | 0 | 0
Level 3 | Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | $ 0 | $ 0

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- Definition Fair value of obligations measured on a recurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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