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Employee Benefit Plans - Pension Expense From Continuing Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Union-administered plans      
Amortization of:      
Postretirement benefit income $ 10,582 $ 9,326 $ 15,553
Pension Plans      
Pension expense from continuing operations      
Interest cost 84,960 78,234  
Amortization of:      
Postretirement benefit income 81,908 29,892 56,833
Pension Plans | Company-administered plans      
Pension expense from continuing operations      
Service cost 11,007 12,108 12,345
Interest cost 84,960 78,234 86,431
Expected return on plan assets (91,034) (101,980) (91,062)
Pension settlement expense 34,974 3,061 0
Amortization of:      
Net actuarial loss 30,708 28,593 32,987
Prior service cost 711 550 579
Postretirement benefit income 71,326 20,566 41,280
Pension Plans | Union-administered plans      
Amortization of:      
Postretirement benefit income 10,582 9,326 15,553
Pension Plans | United States | Company-administered plans      
Amortization of:      
Postretirement benefit income 75,936 28,043 43,717
Pension Plans | Foreign Plan | Company-administered plans      
Amortization of:      
Postretirement benefit income $ (4,610) $ (7,477) $ (2,437)