Segment and Geographic Information - Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment and Geographical Information - Assets [Line Items]
Goodwill	$ 136,152	$ 131,320	$ 58,053
Total Assets	1,426,084	1,234,223
Long-Lived Assets	208,431	165,275
United States [Member]
Segment and Geographical Information - Assets [Line Items]
Long-Lived Assets	77,639	74,319
The Netherlands [Member]
Segment and Geographical Information - Assets [Line Items]
Long-Lived Assets	65,570	32,679
CZECH REPUBLIC
Segment and Geographical Information - Assets [Line Items]
Long-Lived Assets	22,950	12,019
Other Geographical Regions [Member]
Segment and Geographical Information - Assets [Line Items]
Long-Lived Assets	42,272	46,258
Industry [Member]
Segment and Geographical Information - Assets [Line Items]
Goodwill	51,532	53,572
Total Assets	297,987	293,115
Science [Member]
Segment and Geographical Information - Assets [Line Items]
Goodwill	84,620	77,748
Total Assets	365,571	401,795
Intersegment Eliminations [Member]
Segment and Geographical Information - Assets [Line Items]
Total Assets	$ 762,526	$ 539,313