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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments

    2014   2015   2016  
A   29%   31%   30%  
B   26%   26%   28%  
C   14%   13%   14%  
D   18%   18%   19%  
Total   87%   88%   91%