Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Accumulated impairment loss	$ 59,100,000	$ 59,100,000
Weighted percentage use in valuation approach	35.00%	30.00%	35.00%
Impairment of intangible assets	$ 0	$ 0	$ 0
Amortization of intangible assets	7,400,000	6,800,000	$ 7,000,000.0
Milsco Reporting Unit
Goodwill [Line Items]
Accumulated impairment loss	$ 58,800,000	$ 58,800,000
Patents
Goodwill [Line Items]
Weighted average useful life (years)	5 years 10 months 24 days
Customer relationships
Goodwill [Line Items]
Weighted average useful life (years)	9 years 2 months 12 days
Trademarks and other intangibles
Goodwill [Line Items]
Weighted average useful life (years)	8 years 9 months 18 days
Finishing [Member]
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount	15.00%	15.00%	15.00%

Amortization Of Intangible Assets, Continuing Operations

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Reporting Unit, Fair Value Calculation, Weighted Percentage For Each Valuation Approach

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Percentage of fair value of reporting unit in excess of carrying amount.

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