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Pension and Severance Plans (Defined Benefit Plans - Expected future contributions and other disclosures) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan [Abstract]  
Expected contributions in next fiscal year $ 23,000
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2018 6,288
2019 7,516
2020 9,538
2021 11,602
2022 14,143
2023 to 2027 $ 107,557