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Employee Benefit Plans - ABO and PBO (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations $ 2,114,910 $ 2,274,746
Plans with pension obligations in excess of plan assets:    
PBO 1,710,759 1,812,062
ABO 1,691,058 1,788,384
Fair value of plan assets 1,250,032 1,395,790
United States    
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations 1,685,270 1,781,882
Plans with pension obligations in excess of plan assets:    
PBO 1,703,847 1,804,260
ABO 1,685,270 1,781,882
Fair value of plan assets 1,250,032 1,395,790
Foreign Plan    
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations 429,640 492,864
Plans with pension obligations in excess of plan assets:    
PBO 6,912 7,802
ABO 5,788 6,502
Fair value of plan assets $ 0 $ 0