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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Benefits [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 466 $ 428 $ 932 $ 855
Expected return on plan assets (555) (711) (1,110) (1,422)
Amortization of unrecognized net (gain) loss 137 113 274 226
Total net periodic benefit cost 48 (170) 96 (341)
Postretirement Benefit Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 5 8 10 16
Interest cost 45 45 90 90
Amortization of prior service cost 4 4 8 8
Amortization of unrecognized net (gain) loss (97) (70) (194) (140)
Total net periodic benefit cost $ (43) $ (13) $ (86) $ (26)