SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment
Property, plant and equipment	$ 109,427	$ 106,523
Land [Member]
Property, Plant and Equipment
Property, plant and equipment	3,654	3,380
Buildings and improvements [Member]
Property, Plant and Equipment
Property, plant and equipment	$ 41,952	41,429
Buildings and improvements [Member] | Minimum [Member]
Property, Plant and Equipment
Estimated useful life	15 years
Buildings and improvements [Member] | Maximum [Member]
Property, Plant and Equipment
Estimated useful life	30 years
Manufacturing equipment and tooling [Member]
Property, Plant and Equipment
Property, plant and equipment	$ 42,851	38,599
Manufacturing equipment and tooling [Member] | Minimum [Member]
Property, Plant and Equipment
Estimated useful life	3 years
Manufacturing equipment and tooling [Member] | Maximum [Member]
Property, Plant and Equipment
Estimated useful life	15 years
Furniture, fixtures and computer equipment [Member]
Property, Plant and Equipment
Property, plant and equipment	$ 15,997	16,777
Furniture, fixtures and computer equipment [Member] | Minimum [Member]
Property, Plant and Equipment
Estimated useful life	3 years
Furniture, fixtures and computer equipment [Member] | Maximum [Member]
Property, Plant and Equipment
Estimated useful life	10 years
Other [Member]
Property, Plant and Equipment
Property, plant and equipment	$ 4,152	2,937
Other [Member] | Minimum [Member]
Property, Plant and Equipment
Estimated useful life	3 years
Other [Member] | Maximum [Member]
Property, Plant and Equipment
Estimated useful life	10 years
Construction in process [Member]
Property, Plant and Equipment
Property, plant and equipment	$ 821	$ 3,401