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Intangibles (Net of Amortization) and Goodwill (Schedule Of Information Related To Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangibles (net of amortization) and Goodwill [Line Items] |  |  |
Amortizing intangible assets, Accumulated Amortization | $ 16,454 | $ 16,947 |
Goodwill, Gross Carrying Amount | 123,958 | 122,987 |
Amortizing intangible assets and Goodwill, Gross Carrying Amount | 146,398 | 148,827 |
Aggregate amortization expense | 2,907 | 4,206 | $ 7,000
Formulas and Technology [Member] |  |  |
Intangibles (net of amortization) and Goodwill [Line Items] |  |  |
Amortizing intangible assets, Gross Carrying Amount | 6,200 | 9,600 |
Amortizing intangible assets, Accumulated Amortization | 3,617 | 5,416 |
Contracts [Member] |  |  |
Intangibles (net of amortization) and Goodwill [Line Items] |  |  |
Amortizing intangible assets, Gross Carrying Amount | 2,000 | 2,000 |
Amortizing intangible assets, Accumulated Amortization | 800 | 600 |
Customer Bases [Member] |  |  |
Intangibles (net of amortization) and Goodwill [Line Items] |  |  |
Amortizing intangible assets, Gross Carrying Amount | 14,240 | 14,240 |
Amortizing intangible assets, Accumulated Amortization | $ 12,037 | $ 10,931 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 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)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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