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Pensions and Other Postretirement Benefit Plans (Schedule of Funded Status of Plans and Composition of Accrued Pension Cost) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Noncurrent asset | $ 31,100 | $ 21,300 |
Pension plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 239,051 | 211,755 | $ 178,942
Benefit obligation | 245,800 | 227,211 | 201,450
Funded status | (6,749) | (15,456) |
Noncurrent asset | 31,139 | 21,337 |
Current liability | (2,281) | (2,155) |
Noncurrent liability | (35,607) | (34,638) |
Net amount recognized | (6,749) | (15,456) |
Net actuarial loss | 53,065 | 63,240 |
Prior service cost/(credit) | 393 | 639 |
Net amount recognized | 53,458 | 63,879 |
Other postretirement benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 | 0
Benefit obligation | 47,977 | 54,384 | $ 51,127
Funded status | (47,977) | (54,384) |
Noncurrent asset | 0 | 0 |
Current liability | (3,660) | (3,808) |
Noncurrent liability | (44,317) | (50,576) |
Net amount recognized | (47,977) | (54,384) |
Net actuarial loss | 20,736 | 28,119 |
Prior service cost/(credit) | (12,946) | (17,434) |
Net amount recognized | $ 7,790 | $ 10,685 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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