A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of interest capitalized during the period.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant & Equipment:
Depreciation expense	$ 6,190,000	$ 6,217,000	$ 5,955,000
Capitalized interest expense	7,000	0
Goodwill, Impairment Loss	0	0	0
Asset Impairment Charges	0	0	$ 0
Allowance for Doubtful Accounts Receivable, Current	$ 0	$ 0
Land improvements
Property, Plant & Equipment:
Useful life	20 years
Buildings and improvements \| Minimum [Member]
Property, Plant & Equipment:
Useful life	20 years
Buildings and improvements \| Maximum [Member]
Property, Plant & Equipment:
Useful life	40 years
Machinery and equipment \| Minimum [Member]
Property, Plant & Equipment:
Useful life	3 years
Machinery and equipment \| Maximum [Member]
Property, Plant & Equipment:
Useful life	15 years
Tools, dies and patterns \| Minimum [Member]
Property, Plant & Equipment:
Useful life	3 years
Tools, dies and patterns \| Maximum [Member]
Property, Plant & Equipment:
Useful life	5 years