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Non-current liabilities
 9 Months Ended
Sep. 30, 2017
Liabilities, Noncurrent [Abstract]  
Non-current liabilities
Non-current liabilities
Non-current liabilities consists of the following:
 
As of
 
September 30, 2017
 
December 31, 2016
Derivative instruments
$
1,553

 
$
828

Unrecognized tax benefits
692

 
3,640

Deferred rent
7,890

 
7,237

Retirement benefits
2,917

 
1,977

Others
3,182

 
1,137

Non-current liabilities
$
16,234

 
$
14,819