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Segment and Geographic Information (Tables)
9 Months Ended
Sep. 30, 2012
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
The following table summarizes the percentage of the Company's revenues derived from operations outside of the United States:
 
For the Three Months
Ended September 30,
 
For the Nine Months
Ended September 30,
 
2012
 
2011
 
2012
 
2011
Revenues derived from outside of the United States
29
%
 
29
%
 
28
%
 
29
%
Revenues derived from Europe
16
%
 
18
%
 
17
%
 
18
%