Property, Plant and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, plant and equipment, net
Gross	$ 93,022	$ 87,497
Accumulated depreciation	(62,991)	(57,033)
Net	30,031	30,464
Depreciation expense	2,400	2,400	$ 3,200
Land and buildings
Property, plant and equipment, net
Gross	80,491	78,757
Machinery and equipment
Property, plant and equipment, net
Gross	11,080	8,370
Construction in process
Property, plant and equipment, net
Gross	$ 1,451	$ 370