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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill, Impairment Loss | $ 0 | $ 46,792 | $ 0 |
Goodwill | 81,404 | 81,404 | $ 128,208 |
Finite-Lived Intangible Assets, Net | 22,636 |  |  |
Identifiable intangible assets: |  |  |  |
Total carrying value of identifiable intangibles | 22,636 | 36,295 |  |
Intangible Assets, Net (Including Goodwill) | 104,040 | 117,699 |  |
Customer relationships |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 20,198 | 22,785 |  |
Identifiable intangible assets: |  |  |  |
Finite-Lived Intangible Assets, Gross | 29,550 | 29,568 |  |
Proprietary technology |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 895 | 1,093 |  |
Identifiable intangible assets: |  |  |  |
Finite-Lived Intangible Assets, Gross | 6,181 | 6,185 |  |
Trade Names [Member] |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 1,543 | 12,417 |  | $ 10,200
Noncompete agreements |  |  |  |
Identifiable intangible assets: |  |  |  |
Finite-Lived Intangible Assets, Gross | $ 1,854 | $ 1,854 |  |
Minimum | Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 10 years |  |  |
Minimum | Trade Names [Member] |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 5 years |  |  |
Maximum | Customer relationships |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 12 years |  |  |
Maximum | Proprietary technology |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 15 years |  |  |
Maximum | Trade Names [Member] |  |  |  |
Identifiable intangible assets: |  |  |  |
Identifiable Intangible Asset, Useful Life (Yrs) | 13 years |  |  |

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