Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

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Property, Plant and Equipment (Details) (USD $)	12 Months Ended
Property, Plant and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 253,075,000us-gaap_PropertyPlantAndEquipmentGross	$ 246,315,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	188,464,000	182,669,000
Total property, plant and equipment, net	64,611,000us-gaap_PropertyPlantAndEquipmentNet	63,646,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation	11,800,000us-gaap_Depreciation	12,000,000us-gaap_Depreciation	11,200,000us-gaap_Depreciation
Land, Buildings and Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	45,050,000	44,930,000
Machinery and Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	128,998,000	128,796,000
Tools, Dies and Auxiliary Equipment [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	40,352,000	36,324,000
Furniture and Fixtures [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	23,830,000	23,508,000
Leasehold Improvements [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	7,436,000	6,840,000
Construction-in-Progress [Member]
Property, plant and equipment [Abstract]
Total property, plant and equipment	$ 7,409,000	$ 5,917,000