SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment
Property, plant and equipment	$ 174,741	$ 160,725
Land
Property, Plant and Equipment
Property, plant and equipment	3,551	3,794
Buildings and improvements
Property, Plant and Equipment
Property, plant and equipment	$ 58,069	58,045
Buildings and improvements | Minimum
Property, Plant and Equipment
Estimated useful life	15 years
Buildings and improvements | Maximum
Property, Plant and Equipment
Estimated useful life	30 years
Manufacturing equipment and tooling
Property, Plant and Equipment
Property, plant and equipment	$ 72,081	51,955
Manufacturing equipment and tooling | Minimum
Property, Plant and Equipment
Estimated useful life	3 years
Manufacturing equipment and tooling | Maximum
Property, Plant and Equipment
Estimated useful life	15 years
Furniture, fixtures and computer equipment
Property, Plant and Equipment
Property, plant and equipment	$ 21,683	21,061
Furniture, fixtures and computer equipment | Minimum
Property, Plant and Equipment
Estimated useful life	3 years
Furniture, fixtures and computer equipment | Maximum
Property, Plant and Equipment
Estimated useful life	10 years
Other
Property, Plant and Equipment
Property, plant and equipment	$ 6,041	5,762
Other | Minimum
Property, Plant and Equipment
Estimated useful life	3 years
Other | Maximum
Property, Plant and Equipment
Estimated useful life	10 years
Construction in process
Property, Plant and Equipment
Property, plant and equipment	$ 13,316	$ 20,108