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Pension Plans and Other Postretirement Benefits Financial Assets Accounted for at Fair Value on Recurring Basis (Details) - Pension Plans - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 683,469	$ 638,149
Quoted Prices in Active Markets for Identical Items (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	527,104	493,267
Quoted Prices in Active Markets for Identical Items (Level 1) | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	140,548	118,255
Quoted Prices in Active Markets for Identical Items (Level 1) | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	113,174	95,246
Quoted Prices in Active Markets for Identical Items (Level 1) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	270,589	279,731
Quoted Prices in Active Markets for Identical Items (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		35
Quoted Prices in Active Markets for Identical Items (Level 1) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,793
Quoted Prices in Active Markets for Similar Items (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	77,578	71,105
Quoted Prices in Active Markets for Similar Items (Level 2) | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,732	1,587
Quoted Prices in Active Markets for Similar Items (Level 2) | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26,437	31,582
Quoted Prices in Active Markets for Similar Items (Level 2) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	49,409	37,936
Quoted Prices in Active Markets for Similar Items (Level 2) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Quoted Prices in Active Markets for Similar Items (Level 2) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Unobservable Inputs (Level 3) | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Absolute Return Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78,787	73,777
Fair Value, Inputs, Level 1, 2 and 3 | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	142,280	119,842
Fair Value, Inputs, Level 1, 2 and 3 | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	139,611	126,828
Fair Value, Inputs, Level 1, 2 and 3 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	319,998	317,667
Fair Value, Inputs, Level 1, 2 and 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 35
Fair Value, Inputs, Level 1, 2 and 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,793

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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