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Accumulated Other Comprehensive Loss (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-Tax |  | $ (3,119)
Tax |  | (527)
After-Tax |  | (2,592)
Pension Benefits [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-Tax | $ (983) |
After-Tax | (983) |
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-Tax | (1,544) | (1,025)
After-Tax | (1,544) | (1,025)
Accumulated Defined Benefit Plans Adjustment, Termination Gain (Loss) Attributable to Parent [Member] | Postretirement Benefit Plan [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-Tax |  | 4,369
After-Tax |  | 4,369
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Termination Gain (Loss) Attributable to Parent [Member] | Postretirement Benefit Plan [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-Tax |  | (6,637)
Tax |  | (527)
After-Tax |  | (6,110)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Pre-Tax | 561 | 549
After-Tax | $ 561 | 549
Reclassification out of Accumulated Other Comprehensive Income [Member] | 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 |  | (389)
After-Tax |  | (389)
Reclassification out of Accumulated Other Comprehensive Income [Member] | 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 |  | 14
After-Tax |  | $ 14

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