Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Sales to External Customers and Gross Profit by Segment

The following tables summarize various financial amounts for each of our business segments (in thousands):

	Year Ended December 31,
	2015		2014		2013
Sales to External Customers:
Industry Group	$	446,301	$	450,198	$	427,731
Science Group	483,831		506,082		499,723
Total	$	930,132	$	956,280	$	927,454
Gross Profit:
Industry Group	$	233,058	$	229,959	$	222,675
Science Group	221,533		218,196		216,110
Total	$	454,591	$	448,155	$	438,785

Schedule of Goodwill and Total Assets by Segment

	December 31, 2015		December 31, 2014
Goodwill:
Industry Group	$	60,360	$	76,858
Science Group	85,247		93,915
Total	$	145,607	$	170,773
Total Assets:
Industry Group	$	516,397	$	444,168
Science Group	488,096		470,899
Corporate and Eliminations	345,356		502,751
Total	$	1,349,849	$	1,417,818

Schedule of Sales by Geographic Region [Table Text Block]

The following table summarizes sales by geographic region (in thousands):

	Year Ended December 31,
	2015						2014						2013
	Product Sales		Service Sales		Total		Product Sales		Service Sales		Total		Product Sales		Service Sales		Total
U.S. and Canada	$	192,440	$	105,255	$	297,695	$	207,623	$	97,966	$	305,589	$	167,876	$	92,759	$	260,635
Europe	182,720		64,196		246,916		200,995		66,799		267,794		205,857		64,803		270,660
Asia-Pacific Region and Rest of World	310,491		75,030		385,521		314,048		68,849		382,897		335,705		60,454		396,159
Consolidated net sales	$	685,651	$	244,481	$	930,132	$	722,666	$	233,614	$	956,280	$	709,438	$	218,016	$	927,454

Geographic Schedule of Long-Lived Assets [Table Text Block]

Our long-lived assets were geographically located as follows (in thousands):

	December 31, 2015		December 31, 2014
United States	$	72,548	$	76,553
The Netherlands	52,456		59,722
The Czech Republic	36,149		36,534
Other	39,167		58,073
Total	$	200,320	$	230,882