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Goodwill and Other Intangible Assets (Schedule Of Components Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 74,148 | $ 73,990
Accumulated Amortization | (57,247) | (53,262)
Net Carrying Amount | 16,901 | 20,728
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 53,048 | 52,890
Accumulated Amortization | (46,798) | (43,617)
Net Carrying Amount | $ 6,250 | $ 9,273
Useful Lives (in years) | 11 years | 11 years
Trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 15,400 | $ 15,400
Accumulated Amortization | (6,256) | (5,775)
Net Carrying Amount | $ 9,144 | $ 9,625
Useful Lives (in years) | 24 years | 24 years
Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,300 | $ 4,300
Accumulated Amortization | (4,193) | (3,870)
Net Carrying Amount | $ 107 | $ 430
Useful Lives (in years) | 10 years | 10 years
Licensing Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 1,400 | $ 1,400
Net Carrying Amount | $ 1,400 | $ 1,400

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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 Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: 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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- 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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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: 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),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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