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Pensions and Other Postretirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 225,327	$ 239,051	$ 211,755
Pension plans | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	225,329	239,051
Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	724	1,095
Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	98,252	104,642
Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,861	3,819
Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102,837	109,556
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	0
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Common Stocks and equity funds | Pension plans | Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,963	20,213
Debt securities | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt securities | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	98,252	104,642
Debt securities | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt securities | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	98,252	104,642
Insurance contracts | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Insurance contracts | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Insurance contracts | Pension plans | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,861	3,819	$ 3,244
Insurance contracts | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,861	3,819
Insurance contracts | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,861	3,819
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	724	1,095
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	724	1,095
Fixed income funds | Pension plans | Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	101,845	107,012
Limited partnerships | Pension plans | Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,684	$ 2,270

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+ References

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