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Major Clients (Tables)
12 Months Ended
Dec. 31, 2017
Major Clients  
Schedule of sales to major clients, as a percentage of operating revenues

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

A

 

17%

 

 

13%

 

 

21%

 

B

 

10%

 

 

 —

 

 

15%