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Employee Benefit Plans (Details 5)
$ in Thousands
Dec. 31, 2016
USD ($)
DB Pension Plan  
Future Benefit Payments  
2017 $ 3,910
2018 3,820
2019 4,242
2020 4,030
2021 4,266
2022-2026 22,635
Total 42,903
Life and Healthcare Plan  
Future Benefit Payments  
2017 541
2018 475
2019 483
2020 479
2021 475
2022-2026 2,637
Total 5,090
SERPs  
Future Benefit Payments  
2017 673
2018 668
2019 663
2020 700
2021 691
2022-2026 4,099
Total $ 7,494