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Segment Information and Enterprise Reporting (Tables)
9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
The following schedule presents an analysis of the Company’s product revenues based upon the geographic area to which the product was shipped (in thousands, except percentages):
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30, 2017
 
October 1, 2016
 
September 30, 2017
 
October 1, 2016
Geographic area by destination:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
United States
 
$
119,266

 
65.8
%
 
$
114,563

 
71.5
%
 
$
370,403

 
68.3
%
 
$
345,113

 
70.7
%
Europe, Middle East and Africa
 
38,127

 
21.0

 
23,929

 
14.9

 
102,322

 
18.9

 
81,887

 
16.8

Asia and Australia
 
18,078

 
10.0

 
16,630

 
10.4

 
51,801

 
9.6

 
46,815

 
9.6

North and South America (excluding United States)
 
5,800

 
3.2

 
5,164

 
3.2

 
17,644

 
3.2

 
14,368

 
2.9

     Total product revenue
 
$
181,271

 
100.0
%
 
$
160,286

 
100.0
%
 
$
542,170

 
100.0
%
 
$
488,183

 
100.0
%
Long-lived Assets by Geographic Areas [Table Text Block]
The Company’s consolidated long-lived assets (total non-current assets excluding deferred taxes, goodwill and intangible assets) by geographic area are (in thousands, except percentages):
 
 
September 30, 2017
 
December 31, 2016
Long-lived assets by geographic area:
 
 
 
 
 
 
 
 
United States
 
$
262,249

 
96.3
%
 
$
216,784

 
96.3
%
International
 
10,148

 
3.7

 
8,383

 
3.7

     Total
 
$
272,397

 
100.0
%
 
$
225,167

 
100.0
%