Retirement Plans and Postretirement Medical Benefits (Level 3 Gains and Losses) (Details) - United States - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	$ 45,275	$ 45,335
Realized gains	0	0
Unrealized losses	6,357	(2,134)
Net purchases, sales and settlements	1,663	1,221
Foreign currency changes	(804)	853
Fair value of plan assets - end of year	52,491	45,275
Private equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	69,347	71,337
Realized gains	1,791	1,554
Unrealized losses	6,958	(3,360)
Net purchases, sales and settlements	(602)	(184)
Foreign currency changes	0	0
Fair value of plan assets - end of year	77,494	69,347
Diversified growth funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	50,750	47,621
Realized gains	0	0
Unrealized losses	1,995	1,493
Net purchases, sales and settlements	0	56
Foreign currency changes	(576)	1,580
Fair value of plan assets - end of year	$ 52,169	$ 50,750

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

+ References

+ Details

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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