Retirement Plans and Postretirement Medical Benefits (Level 3 Gains and Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Diversified growth funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	$ 40,766	$ 44,024
Unrealized (losses) gains	4,954	(4,948)
Net purchases, sales and settlements	107	4,090
Other	0
Foreign currency	1,794	(2,400)
Fair value of plan assets - end of year	47,621	40,766
United States
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	1,327,034
Fair value of plan assets - end of year	1,487,018	1,327,034
United States \| Private Equity Funds And Defined Benefit Plan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	129,627	129,714
Realized gains	20,501	9,265
Unrealized (losses) gains	(17,805)	3,053
Net purchases, sales and settlements	(37,378)	(12,405)
Fair value of plan assets - end of year	94,945	129,627
United States \| Private equity
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	32,750	38,362
Realized gains	5,625	8,264
Unrealized (losses) gains	(5,288)	(1,409)
Net purchases, sales and settlements	(9,479)	(12,467)
Fair value of plan assets - end of year	23,608	32,750
United States \| Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	96,877	91,352
Realized gains	14,876	1,001
Unrealized (losses) gains	(12,517)	4,462
Net purchases, sales and settlements	(27,899)	62
Fair value of plan assets - end of year	71,337	96,877
Foreign
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	562,517
Fair value of plan assets - end of year	668,308	562,517
Foreign \| Private Equity Funds And Defined Benefit Plan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	82,909	85,625
Unrealized (losses) gains	4,155	(3,631)
Net purchases, sales and settlements	1,725	5,743
Other	687
Foreign currency	3,480	(4,828)
Fair value of plan assets - end of year	92,956	82,909
Foreign \| Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning of year	42,143	41,601
Unrealized (losses) gains	(799)	1,317
Net purchases, sales and settlements	1,618	1,653
Other	687
Foreign currency	1,686	(2,428)
Fair value of plan assets - end of year	$ 45,335	$ 42,143

Defined Benefit Plan, Plan Assets, Other

No definition available.

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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 sold.

+ References

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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

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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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