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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-Tax | $ 47 | $ 43
Tax | 11 | 15
After-Tax | 36 | 28
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
Tax | 25 | 42
After-Tax | 88 | 77
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) | (80)
Tax | (15) | (28)
After-Tax | (55) | (52)
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 | 4
Tax | 1 | 1
After-Tax | $ 3 | $ 3

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