Property, Plant, and Equipment, Net (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 163,674,000us-gaap_PropertyPlantAndEquipmentGross	$ 162,430,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(90,048,000)	(87,703,000)
Property, plant and equipment, net, excluding contruction in progress	73,626,000	74,727,000
Construction in progress	2,509,000us-gaap_ConstructionInProgressGross	843,000us-gaap_ConstructionInProgressGross
Total property, plant, and equipment, net	76,135,000us-gaap_PropertyPlantAndEquipmentNet	75,570,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	14,100,000us-gaap_Depreciation	14,200,000us-gaap_Depreciation	13,400,000us-gaap_Depreciation
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	51,046,000	51,901,000
Construction in progress	146,000	0
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	52,449,000	48,859,000
Construction in progress	1,045,000	158,000
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,558,000	26,495,000
Construction in progress	284,000	134,000
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,344,000	17,749,000
Construction in progress	370,000	104,000
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,957,000	9,754,000
Construction in progress	335,000	372,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,899,000	3,835,000
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,421,000	3,837,000
Other
Property, Plant and Equipment [Line Items]
Construction in progress	329,000	75,000
People's Republic of China [Member]
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, net	$ 66,000,000	$ 68,200,000

Property, Plant and Equipment, Net, Excluding Contruction in Progress

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

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