Employee and Retiree Benefit Plans - Plans' Benefit Obligations and Fair Value of Assets and Statement of Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in plan assets
Beginning balance	$ 586,720
Ending balance	611,302	$ 586,720
Pension Benefits
Change in benefit obligation
Beginning balance	981,467	883,269
Service cost	8,199	7,967	$ 7,964
Interest cost	14,784	21,127	27,835
Participant contributions	0	0
Actuarial loss (gain)	(24,440)	107,258
Medicare Part D subsidy	0	0
Exchange rate changes	(1,764)	7,074
Benefits paid	(38,866)	(46,066)
Curtailments	0	(7,596)
Special termination benefits	0	8,434
Plan amendments	0	0
Ending balance	939,380	981,467	883,269
Change in plan assets
Beginning balance	586,720	547,484
Actual return on plan assets	33,687	48,115
Employer contributions	31,607	30,178
Participant contributions	0	0
Medicare Part D subsidy	0	0
Exchange rate changes	(1,846)	7,009
Benefits paid	(38,866)	(46,066)
Ending balance	611,302	586,720	547,484
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31
Deferred charges and other assets	5,535	4,572
Other accrued liabilities	(10,144)	(9,468)
Deferred credits and other liabilities	(323,469)	(389,851)
Funded status and net plan liability recognized at December 31	(328,078)	(394,747)
Other Postretirement Benefits
Change in benefit obligation
Beginning balance	108,378	108,401
Service cost	1,295	1,373	1,559
Interest cost	2,071	2,626	3,864
Participant contributions	2,648	2,225
Actuarial loss (gain)	(9,519)	3,758
Medicare Part D subsidy	300	243
Exchange rate changes	3	13
Benefits paid	(4,041)	(4,238)
Curtailments	0	(6,023)
Special termination benefits	0	0
Plan amendments	(5,002)	0
Ending balance	96,133	108,378	108,401
Change in plan assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	1,093	1,770
Participant contributions	2,648	2,225
Medicare Part D subsidy	300	243
Exchange rate changes	0	0
Benefits paid	(4,041)	(4,238)
Ending balance	0	0	$ 0
Funded status and amounts recognized in the Consolidated Balance Sheets at December 31
Deferred charges and other assets	0	0
Other accrued liabilities	(4,867)	(5,298)
Deferred credits and other liabilities	(91,266)	(103,080)
Funded status and net plan liability recognized at December 31	$ (96,133)	$ (108,378)