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Employee Benefit Plans (Other Changes in Plan Assets and Benefit Obligations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Retirement Benefits [Abstract] |  |
Current year actuarial loss | $ (9,319) | $ (2,846)
Amortization of actuarial loss | 2,821 | 2,881
Total recognized in other comprehensive loss | $ (6,498) | $ 35

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