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Employee Benefit Plans (Summary Of Accumulated Benefit Obligation) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 309,970 | $ 262,327
Qualified Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 288,328 | 237,855
Non-Qualified Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 21,642 | $ 24,472

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- 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. + Details
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- Details
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- Details
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