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Financial Instruments - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Restricted investment:    
Rabbi Trusts $ 64,382 $ 59,495
Marketable equity and fixed income securities 72,616 54,392
Other non-current assets 20,026 19,345
Quoted Prices in Active Markets (Level 1)    
Restricted investment:    
Rabbi Trusts 13,032 12,635
Marketable equity and fixed income securities 1,637 2,069
Significant Other Observable Inputs (Level 2)    
Restricted investment:    
Rabbi Trusts 51,350 46,860
Marketable equity and fixed income securities 70,979 52,323
Other non-current assets 20,026 19,345
Interest Rate Swap    
Restricted investment:    
Interest rate swap derivatives 3,352 4,851
Interest Rate Swap | Significant Other Observable Inputs (Level 2)    
Restricted investment:    
Interest rate swap derivatives $ 3,352 $ 4,851