Retirement Plans and Postretirement Medical Benefits (Level 3 Gains and Losses) (Details) - United States - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	$ 45,335	$ 42,143
Realized gains	0	0
Unrealized losses	(2,134)	(799)
Net purchases, sales and settlements	1,221	1,618
Foreign currency changes	853	2,373
Fair value of plan assets - end of year	45,275	45,335
Private equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	71,337	96,877
Realized gains	1,554	14,876
Unrealized losses	(3,360)	(12,517)
Net purchases, sales and settlements	(184)	(27,899)
Foreign currency changes	0	0
Fair value of plan assets - end of year	69,347	71,337
Diversified growth funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Fair value of plan assets - beginning of year	47,621	40,766
Realized gains	0	0
Unrealized losses	1,493	4,954
Net purchases, sales and settlements	56	107
Foreign currency changes	1,580	1,794
Fair value of plan assets - end of year	$ 50,750	$ 47,621

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

+ Details

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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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