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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 12,041 | $ 16,360 | $ 17,117
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 12,041 | 10,930 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 4,828 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 0 | 0 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 12,041 | 1,202 |
Cash and Cash Equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 12,041 | 1,202 |
Mutual funds/Investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 5,421 |
Mutual funds/Investment funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 5,206 |
Mutual funds/Investment funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 215 |
Common stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 5,575 |
Common stocks | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 3,763 |
Common stocks | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 1,812 |
U.S. Government agencies |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 301 |
U.S. Government agencies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 301 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 1,277 |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 1,277 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 1,223 |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 1,223 |
Alternative investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets, Not Subject to Fair Value Hierarchy |  | 602 |
Total |  | 1,361 |
Alternative investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 759 |
Alternative investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 0 |
Alternative investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | $ 0 |

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