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Defined Benefit Plans (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Dec. 31, 2021
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contributions by employer to defined benefit plan | $ 285,000 |
Scenario Forecast [Member] |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Contributions by employer to defined benefit plan |  | $ 0

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