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Benefit Plans (Benefit Payments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Benefit payments representing the company's obligations to employees      
2019 $ 9,105    
2020 882    
2021 874    
2022 865    
2023 856    
Thereafter 19,892    
Total benefit payments $ 32,474 $ 32,820 $ 28,624