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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Benefits [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 236 $ 358 $ 472 $ 716
Expected return on plan assets (584) (609) (1,168) (1,218)
Amortization of unrecognized net (gain) loss 156 140 312 280
Total net periodic benefit cost $ (192) $ (111) $ (384) $ (222)