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Employee Benefit Plans - Benefit Payments and Contributions (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Estimated Future Employer Contributions [Abstract]  
Estimated future employer contributions in next fiscal year $ 5,400
Other Postretirement Benefit Plans, Defined Benefit [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2019 717
2020 705
2021 681
2022 663
2023 641
2024 - 2028 2,794
Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2019 13,500
2020 5,353
2021 11,474
2022 8,742
2023 4,220
2024 - 2028 18,933
Domestic Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2019 33,990
2020 37,086
2021 37,217
2022 36,896
2023 36,117
2024 - 2028 166,962
Foreign Plan [Member] | Qualified Plan [Member] | Pension Plan [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2019 9,069
2020 8,484
2021 9,043
2022 9,339
2023 10,754
2024 - 2028 $ 63,653