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Employee Benefit Plans - ABO and PBO (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations $ 2,301,948 $ 2,114,910
Plans with pension obligations in excess of plan assets:    
PBO 1,841,479 1,710,759
ABO 1,819,838 1,691,058
Fair value of plan assets 1,423,787 1,250,032
United States    
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations 1,812,813 1,685,270
Plans with pension obligations in excess of plan assets:    
PBO 1,832,786 1,703,847
ABO 1,812,813 1,685,270
Fair value of plan assets 1,423,787 1,250,032
Foreign Plan    
Summary of pension obligations greater than fair value of related plan assets    
Total accumulated benefit obligations 489,135 429,640
Plans with pension obligations in excess of plan assets:    
PBO 8,693 6,912
ABO 7,025 5,788
Fair value of plan assets $ 0 $ 0