Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Benefit Plan, Future Payments (Details)

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Benefit Plans - Benefit Plan, Future Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Pension Plans | U.S.  
Defined Benefit Plan, Expected Future Benefit Payment  
2018 $ 14,626
2019 15,363
2020 15,718
2021 16,371
2022 15,373
Years 2023-2026 76,506
Expected future payments 1,760
Defined Benefit Pension Plans | Foreign  
Defined Benefit Plan, Expected Future Benefit Payment  
2018 2,588
2019 3,331
2020 2,943
2021 3,197
2022 3,630
Years 2023-2026 22,716
Expected future payments 4,769
Supplemental Retirement Plans  
Defined Benefit Plan, Expected Future Benefit Payment  
2018 1,115
2019 1,087
2020 1,056
2021 1,024
2022 987
Years 2023-2026 4,371
Expected future payments 1,115
Other Postretirement Benefits Plans  
Defined Benefit Plan, Expected Future Benefit Payment  
2018 629
2019 607
2020 457
2021 413
2022 273
Years 2023-2026 1,015
Expected future payments $ 629