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Pension Benefits - Expected Cash Flows (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Expected contributions to plan trusts  
2020 $ 6,000
Expected benefit payments:  
2020 10,221
2021 10,665
2022 11,174
2023 11,518
2024 11,815
2025 through 2029 61,203
Total expected benefit payments $ 116,596