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Financial Instruments - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Restricted investment:    
Rabbi Trusts $ 59,394 $ 59,495
Marketable equity and fixed income securities 57,793 54,392
Other non-current assets 19,669 19,345
Quoted Prices in Active Markets (Level 1)    
Restricted investment:    
Rabbi Trusts 12,766 12,635
Marketable equity and fixed income securities 4,374 2,069
Significant Other Observable Inputs (Level 2)    
Restricted investment:    
Rabbi Trusts 46,628 46,860
Marketable equity and fixed income securities 53,419 52,323
Other non-current assets 19,669 19,345
Interest Rate Swap    
Restricted investment:    
Interest rate swap derivatives 3,985 4,851
Interest Rate Swap | Significant Other Observable Inputs (Level 2)    
Restricted investment:    
Interest rate swap derivatives $ 3,985 $ 4,851