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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax	$ 46	$ 44	$ 140	$ 130
Tax	10	16	32	47
After-Tax	36	28	108	83
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-Tax	112	119	338	357
Tax	23	42	73	127
After-Tax	89	77	265	230
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)	(79)	(210)	(238)
Tax	(14)	(28)	(45)	(84)
After-Tax	(56)	(51)	(165)	(154)
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	12	11
Tax	1	2	4	4
After-Tax	$ 3	$ 2	$ 8	$ 7

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

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