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Non-current liabilities (Tables)
 12 Months Ended
Dec. 31, 2016
Liabilities, Noncurrent [Abstract]  
Other Noncurrent Liabilities
Non-current liabilities consists of the following:
 
December 31, 2016
 
December 31, 2015
Derivative instruments
$
828

 
$
1,132

Unrecognized tax benefits
3,640

 
3,066

Deferred rent
7,237

 
6,515

Retirement benefits
1,977

 
1,441

Other non-current liabilities
1,137

 
5,501

Non-current liabilities
$
14,819

 
$
17,655