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Employee Benefits Plans (Details 8) - Pension Plans $ in Thousands | Dec. 31, 2017 USD ($)
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Pension benefits expected to be paid |
2018 | $ 102,131
2019 | 104,563
2020 | 109,013
2021 | 113,370
2022 | 117,272
2023-2027 | $ 626,726

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