Retirement Plans and Other Postretirement Benefits - Amounts Recognized on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	$ 545,723	$ 502,992
Pension Benefits
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	265,129	165,861
Current liability	(17,047)	(15,700)
Noncurrent liability	(152,865)	(166,484)
Net amount recognized (funded status)	95,217	(16,323)
Other Benefits
Amounts recognized on the Consolidated Balance Sheets
Noncurrent asset	280,594	337,131
Current liability	0	0
Noncurrent liability	0	0
Net amount recognized (funded status)	$ 280,594	$ 337,131