v3.8.0.1

Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) segment customer	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items]
Number of business segments | segment	1
Percentage of copper use in relation to cost of goods sold	69.70%	65.20%	72.10%
Shipping and handling cost	$ 26,200,000	$ 24,100,000	$ 22,700,000
Certificates of deposit	$ 30,200,000	$ 0
Buildings and Improvements | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment (in years)	15 years
Buildings and Improvements | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment (in years)	39 years
Machinery and Equipment | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment (in years)	3 years
Machinery and Equipment | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment (in years)	20 years
Furniture and Fixtures | Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment (in years)	3 years
Furniture and Fixtures | Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment (in years)	15 years
Customer Concentration Risk | Sales Revenue, Net
Significant Accounting Policies [Line Items]
Customer concentration risk, number of customers | customer	2

X

- Definition

A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68080631&loc=d3e61069-111654

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60635-111653

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82851458&loc=d3e221937-122793

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Customer Concentration Risk, Number of Customers

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Percentage of copper use in relation to cost of goods sold.

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Significant Accounting Policies [Line Items]

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