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