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.

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Intangibles (Net of Amortization) and Goodwill (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangibles (net of amortization) and Goodwill [Line Items]
Intangibles (net of amortization) and goodwill	$ 129,944	$ 131,880
Accumulated Goodwill Impairment	0	0
Amortization of Intangible Assets	$ 2,907	$ 4,206	$ 7,000
Formulas and Technology [Member] \| Maximum [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years	6 years
Contracts [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years	10 years
Customer Bases [Member] \| Minimum [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years	4 years
Customer Bases [Member] \| Maximum [Member]
Intangibles (net of amortization) and Goodwill [Line Items]
Estimated economic life, in years	20 years