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Defined Benefit Pension Plans Expected Future Annual Benefit Payments (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
2017 $ 3,655
2018 2,662
2019 2,737
2020 3,285
2021 3,918
2022-2026 $ 22,929