Segment Information Segment Information - Long Lived Assets by Geographical Area (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 111,164	$ 130,114
United States
Long-Lived Assets [Line Items]
Property, plant and equipment, net	53,042	62,186
The Netherlands
Long-Lived Assets [Line Items]
Property, plant and equipment, net	30,554	37,367
U.K.
Long-Lived Assets [Line Items]
Property, plant and equipment, net	14,660	15,523
France
Long-Lived Assets [Line Items]
Property, plant and equipment, net	11,178	13,133
Canada
Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 1,730	$ 1,905