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Selling, general and administrative expenses
 12 Months Ended
Dec. 31, 2016
Selling General And Administrative Expenses [Abstract]  
Selling, general and administrative expenses

22. Selling, general and administrative expenses

Selling, general and administrative expenses consist of the following:

 

 

 

Year ended December 31,

 

 

 

2014

 

 

2015

 

 

2016

 

Personnel expenses

 

$

419,299

 

 

$

430,088

 

 

$

469,956

 

Operational expenses

 

 

157,755

 

 

 

169,042

 

 

 

174,060

 

Depreciation and amortization

 

 

8,592

 

 

 

8,984

 

 

 

9,013

 

 

 

$

585,646

 

 

$

608,114

 

 

$

653,029