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Pension and Severance Plans (Defined Benefit Plans - Expected future contributions and other disclosures) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan [Abstract]  
Expected contributions in next fiscal year $ 23,000
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2020 9,569
2021 11,780
2022 13,093
2023 15,573
2024 18,584
2025 to 2029 $ 137,242