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Non-current liabilities
 12 Months Ended
Dec. 31, 2017
Liabilities, Noncurrent [Abstract]  
Non-current liabilities
Non-current liabilities
Non-current liabilities consists of the following:
 
As of
 
December 31, 2017
 
December 31, 2016
Derivative instruments
$
322

 
$
828

Unrecognized tax benefits
892

 
3,640

Deferred rent
8,176

 
7,237

Retirement benefits
3,377

 
1,977

Others
3,435

 
1,137

Non-current liabilities
$
16,202

 
$
14,819