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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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Goodwill And Other Intangible Assets [Line Items]

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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