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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pre-Tax $ 47 $ 43 $ 94 $ 86
Tax 11 16 22 31
After-Tax 36 27 72 55
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pre-Tax 113 119 226 238
Tax 24 43 49 85
After-Tax 89 76 177 153
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Postretirement Benefit Plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pre-Tax (70) (79) (140) (159)
Tax (15) (28) (30) (56)
After-Tax (55) (51) (110) (103)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Postretirement Benefit Plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pre-Tax 4 3 8 7
Tax 2 1 3 2
After-Tax $ 2 $ 2 $ 5 $ 5