Segment Information - Geographic Information - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Information
Property, plant and equipment, net	$ 366,442	$ 311,019	$ 290,586
United States
Segment Information
Property, plant and equipment, net	225,105	228,057	205,429
France
Segment Information
Property, plant and equipment, net	52,650
Belgium
Segment Information
Property, plant and equipment, net	46,648	47,921	52,943
United Kingdom
Segment Information
Property, plant and equipment, net	12,586	15,849	11,100
China
Segment Information
Property, plant and equipment, net	12,482	13,779	15,583
Italy
Segment Information
Property, plant and equipment, net	11,624
Japan
Segment Information
Property, plant and equipment, net	5,207	5,255	5,309
Singapore
Segment Information
Property, plant and equipment, net	74	65	86
Denmark
Segment Information
Property, plant and equipment, net	41	53	59
Canada
Segment Information
Property, plant and equipment, net	11	24	49
Brazil
Segment Information
Property, plant and equipment, net	$ 14	14	22
Germany
Segment Information
Property, plant and equipment, net		$ 2	$ 6