Retirement Plans and Postretirement Medical Benefits (Level 3 Gains and Losses) (Details) - United States - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Private equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	$ 77,494	$ 69,347
Realized gains	1,058	1,791
Unrealized gains (losses)	12,666	6,958
Net purchases, sales and settlements	282	(602)
Foreign currency changes	0	0
Fair value of plan assets - end of year	91,500	77,494
Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	52,491	45,275
Realized gains	0	0
Unrealized gains (losses)	(6,741)	6,357
Net purchases, sales and settlements	1,729	1,663
Foreign currency changes	(4,499)	(804)
Fair value of plan assets - end of year	42,980	52,491
Diversified growth funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	52,169	50,750
Realized gains	0	0
Unrealized gains (losses)	(5,933)	1,995
Net purchases, sales and settlements	(16,474)	0
Foreign currency changes	(5,368)	(576)
Fair value of plan assets - end of year	$ 24,394	$ 52,169

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

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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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