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Employee Benefit Plans (Other Changes In Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other comprehensive income (loss) at December 31, prior year | $ (97,466) | $ (88,580)
Net gain (loss) arising during period | 4,090 | 16,927
Actuarial loss (gain) | 9,576 | 8,042
Curtailment loss recognized |  |
Other comprehensive income (loss) at December 31, current year | (91,979) | (97,466)
Post-Retirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other comprehensive income (loss) at December 31, prior year | 3,092 | 3,242
Net gain (loss) arising during period | (4,042) | 582
Prior Service credit (cost) arising during period |  |
Actuarial loss (gain) |  | (155)
Prior service cost | (577) | (577)
Other comprehensive income (loss) at December 31, current year | $ (1,527) | $ 3,092

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- Definition Amount, before tax, of 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 (i) -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 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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