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Employee Benefit Plans - Benefit Payments and Contributions (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Estimated Future Employer Contributions [Abstract]    
Estimated future employer contributions in next fiscal year $ 4,600,000  
Other Postretirement Benefit Plans, Defined Benefit [Member]    
Expected Future Benefit Payments by Fiscal Year [Abstract]    
2020 704,000  
2021 675,000  
2022 658,000  
2023 634,000  
2024 608,000  
2025 - 2029 2,626,000  
Estimated Future Employer Contributions [Abstract]    
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 $ 0
Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]    
Expected Future Benefit Payments by Fiscal Year [Abstract]    
2020 12,698,000  
2021 11,820,000  
2022 4,428,000  
2023 4,442,000  
2024 3,808,000  
2025 - 2029 14,453,000  
Estimated Future Employer Contributions [Abstract]    
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0
United States | Qualified Plan [Member] | Pension Plan [Member]    
Expected Future Benefit Payments by Fiscal Year [Abstract]    
2020 37,225,000  
2021 35,141,000  
2022 35,407,000  
2023 33,303,000  
2024 34,510,000  
2025 - 2029 149,224,000  
Estimated Future Employer Contributions [Abstract]    
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 74,016,000
Foreign Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]    
Expected Future Benefit Payments by Fiscal Year [Abstract]    
2020 8,592,000  
2021 8,720,000  
2022 9,205,000  
2023 10,578,000  
2024 11,618,000  
2025 - 2029 60,816,000  
Estimated Future Employer Contributions [Abstract]    
Defined Benefit Plan, Plan Assets, Payment for Settlement $ 4,350,000 $ 1,472,000