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Market Concentrations (Tables) | 12 Months Ended
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Dec. 31, 2016
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:
|  | 2016 |  | 2015 |  | 2014
Customer 1 |  | 22% |  | 22% |  | 21%
Customer 2 |  | 28% |  | 28% |  | 27%
Customer 3 |  | 29% |  | 32% |  | 34%
Customer 4 |  | 10% |  | 9% |  | 11%

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