For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 280

-SubTopic 10

-Section 50

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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Industry Segments (Details) (USD $)	3 Months Ended								12 Months Ended
Industry Segments (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 Segments	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of operating segments									2us-gaap_NumberOfOperatingSegments
Net sales	$ 158,271,000us-gaap_SalesRevenueNet	$ 162,109,000us-gaap_SalesRevenueNet	$ 152,784,000us-gaap_SalesRevenueNet	$ 150,485,000us-gaap_SalesRevenueNet	$ 144,724,000us-gaap_SalesRevenueNet	$ 141,442,000us-gaap_SalesRevenueNet	$ 153,623,000us-gaap_SalesRevenueNet	$ 144,944,000us-gaap_SalesRevenueNet	$ 623,649,000us-gaap_SalesRevenueNet	$ 584,733,000us-gaap_SalesRevenueNet	$ 545,572,000us-gaap_SalesRevenueNet
Foreign Countries [Member]
Segment Reporting Information [Line Items]
Net sales									110,400,000	95,100,000	81,000,000
Long-lived assets	$ 44,800,000				$ 16,900,000				$ 44,800,000	$ 16,900,000
Sales [Member] \| BRAZIL
Segment Reporting Information [Line Items]
Concentration risk percentage									7.00%	8.00%	5.00%
Sales [Member] \| Canada [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									4.20%	3.30%	4.40%