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Employee Benefit Plans (Summary Of Assets Segregated By Level Of Valuation Inputs Within The Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 16,360 | $ 17,117 | $ 17,435
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,930 | 11,973 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 4,828 | 4,529 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,202 | 2,101 |
Cash and Cash Equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,202 | 2,101 |
Mutual funds/Investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,421 | 6,063 |
Mutual funds/Investment funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,206 | 5,797 |
Mutual funds/Investment funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 215 | 266 |
Common stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,575 | 4,284 |
Common stocks | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,763 | 3,103 |
Common stocks | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,812 | 1,181 |
U.S. Government agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 301 | 514 |
U.S. Government agencies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 301 | 514 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,277 | 971 |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,277 | 971 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,223 | 1,597 |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,223 | 1,597 |
Alternative investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets, Not Subject to Fair Value Hierarchy | 602 | 615 |
Total | 1,361 | 1,587 |
Alternative investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 759 | 972 |
Alternative investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Alternative investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 0 | $ 0 |

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- Definition Defined Benefit Plan, Fair Value of Plan Assets, Not Subject to Fair Value Hierarchy + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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