Financial Instruments - Fair Value Assets Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Restricted investments:
Rabbi Trusts	$ 59,495	$ 51,247
Marketable equity and fixed income securities	54,392	47,382
Other non-current assets	19,345	18,887
Quoted Prices in Active Markets (Level 1)
Restricted investments:
Rabbi Trusts	12,635	9,547
Marketable equity and fixed income securities	2,069	19,010
Significant Other Observable Inputs (Level 2)
Restricted investments:
Rabbi Trusts	46,860	41,700
Marketable equity and fixed income securities	52,323	28,372
Other non-current assets	19,345	18,887
Interest Rate Swap
Restricted investments:
Interest rate swap derivatives	4,851	3,849
Interest Rate Swap | Significant Other Observable Inputs (Level 2)
Restricted investments:
Interest rate swap derivatives	$ 4,851	$ 3,849