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Employee Benefit Plans - Benefit Payments and Contributions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
U.S. Pension Plan, Defined Benefit [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2017 $ 38,772
2018 38,243
2019 41,251
2020 41,666
2021 40,844
2022 - 2026 189,701
Non-U.S. Pension Plans, Defined Benefit [Member]  
Estimated Future Employer Contributions [Abstract]  
Estimated future employer contributions in next fiscal year 3,500
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2017 7,719
2018 7,584
2019 8,287
2020 9,372
2021 9,984
2022 - 2026 54,987
Supplemental Employee Retirement Plans, Defined Benefit [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2017 17,760
2018 8,055
2019 6,417
2020 15,189
2021 11,038
2022 - 2026 26,452
Other Postretirement Benefit Plans, Defined Benefit [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2017 719
2018 704
2019 689
2020 663
2021 649
2022 - 2026 $ 2,882