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Employee Retirement Plans - Changes in Healthcare Cost Trend Rate (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Amounts that will be amortized from accumulated other comprehensive income loss into net periodic pension or OPEB cost in the next fiscal year |
Actuarial gains (losses) | $ 0
Other postretirement benefit cost |
Amounts included in other comprehensive loss, net of tax |
Net actuarial gain (loss) | $ 2,113

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