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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill And Other Intangible Assets [Line Items] |  |  |
Goodwill, Impairment Loss | $ 46,792 | $ 0 | $ 0
Goodwill | 81,404 | 128,208 | $ 117,822
Finite-Lived Intangible Assets, Net | 36,295 |  |
Identifiable intangible assets: |  |  |
Total carrying value of identifiable intangibles | 36,295 | 40,552 |
Intangible Assets, Net (Including Goodwill) | 117,699 | 168,760 |
Customer relationships |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Net | 22,785 | 25,444 |
Identifiable intangible assets: |  |  |
Finite-Lived Intangible Assets, Gross | 29,568 | 29,647 |
Proprietary technology |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Net | 1,093 | 1,700 |
Identifiable intangible assets: |  |  |
Finite-Lived Intangible Assets, Gross | 6,185 | 6,203 |
Trade Names [Member] |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Net | 12,417 | 13,408 |
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) | 2 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) | 12 years |  |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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