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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax | $ 44 | $ 47 | $ 87 | $ 94
Tax |  | 11 |  | 22
After-Tax | 44 | 36 | 87 | 72
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax | 137 | 113 | 274 | 226
Tax |  | 24 |  | 49
After-Tax | 137 | 89 | 274 | 177
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss) Attributable to Parent [Member] | Postretirement Benefit Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax | (97) | (70) | (194) | (140)
Tax |  | (15) |  | (30)
After-Tax | (97) | (55) | (194) | (110)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Curtailment Cost Attributable to Parent [Member] | Postretirement Benefit Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Pre-Tax | 4 | 4 | 7 | 8
Tax |  | 2 |  | 3
After-Tax | $ 4 | $ 2 | $ 7 | $ 5

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