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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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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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