| Employee Retirement Plans - Changes in Healthcare Cost Trend Rate (Details) $ in Thousands | 12 Months Ended | 
|---|---|
| Dec. 31, 2021  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) | $ 2,471 | 
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- Definition Amount of gain (loss) from change in actuarial assumptions related to pension plan termination which (increases) decreases benefit obligation of defined benefit plan. No definition available. 
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- References No definition available. 
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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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- Details 
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