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Accumulated Other Comprehensive Loss (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] - Pension Benefits [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pre-Tax $ 155 $ 140 $ 467 $ 421
After-Tax $ 155 $ 140 $ 467 $ 421