Retirement Plans and Other Postretirement Benefits - Amounts Recognized on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	$ 342,102	$ 323,438
Pension Plans
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	0	57,378
Current liability	(13,130)	(17,190)
Noncurrent liability	(139,317)	(112,702)
Net amount recognized (funded status)	(152,447)	(72,514)
Other Benefits Plans
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	342,102	266,060
Current liability	0	0
Noncurrent liability	0	0
Net amount recognized (funded status)	$ 342,102	$ 266,060