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Market Concentrations (Tables)
 12 Months Ended
Dec. 31, 2015
Risks and Uncertainties [Abstract]  
Schedule of revenues concentration from major customers
Total gross revenues by customer for each customer representing 10% or more of consolidated gross revenues are summarized below for the years ended December 31:
 
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
Customer 1
 
22%
 
21%
 
19%
Customer 2
 
28%
 
27%
 
23%
Customer 3
 
32%
 
34%
 
23%
Customer 4
 
9%
 
11%
 
24%