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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax	$ (3,119)	$ (790)
Tax	(527)	(169)
After-Tax	(2,592)	(621)
Accumulated Defined Benefit Plans Adjustment, Actuarial Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax	(1,025)	(1,210)
Tax		(258)
After-Tax	(1,025)	(952)
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		237
Tax		50
After-Tax		187
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 Prior Service Curtailment Cost Attributable to Parent [Member] | Postretirement Benefit Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax		14
Tax		3
After-Tax		11
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	549	451
Tax		96
After-Tax	549	355
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)	(282)
Tax		(60)
After-Tax	(389)	$ (222)
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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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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