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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Benefits [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost $ 236 $ 358
Expected return on plan assets (584) (609)
Amortization of unrecognized net (gain) loss 156 140
Total net periodic benefit cost $ (192) $ (111)