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Employee Benefit Plans - Benefit Payments and Contributions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
U.S. Pension Plan, Defined Benefit [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2016 $ 33,053
2017 34,776
2018 37,162
2019 37,574
2020 40,574
2021 - 2025 206,540
Non-U.S. Pension Plans, Defined Benefit [Member]  
Estimated Future Employer Contributions [Abstract]  
Estimated future employer contributions in next fiscal year 6,300
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2016 6,392
2017 6,546
2018 6,836
2019 6,959
2020 7,176
2021 - 2025 42,376
Supplemental Employee Retirement Plans, Defined Benefit [Member]  
Estimated Future Employer Contributions [Abstract]  
Estimated future employer contributions in next fiscal year 27,900
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2016 27,949
2017 12,358
2018 11,656
2019 13,596
2020 11,728
2021 - 2025 66,083
Other Postretirement Benefit Plans, Defined Benefit [Member]  
Expected Future Benefit Payments by Fiscal Year [Abstract]  
2016 939
2017 915
2018 891
2019 852
2020 829
2021 - 2025 $ 3,708