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Organization Consolidation and Presentation of Financial Statements (Tables)
6 Months Ended
Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments
    2014   2015
A   27%   25%
B   28%   31%
C   14%   13%
D   19%   18%
Total   88%   87%