Retirement Plans and Other Postretirement Benefits - Amounts Recognized on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	$ 323,438	$ 396,599
Pension Benefits
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	57,378	153,773
Current liability	(17,190)	(17,531)
Noncurrent liability	(112,702)	(116,286)
Net amount recognized (funded status)	(72,514)	19,956
Other Benefits
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	266,060	242,826
Current liability	0	0
Noncurrent liability	0	0
Net amount recognized (funded status)	$ 266,060	$ 242,826