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Cash and cash equivalents
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Cash and cash equivalents
8.

Cash and cash equivalents

 

     2017      2016  

Checking and saving accounts

    $ 145,283      $ 173,943  

Time deposits of no more than ninety days

      30,000        57,500  

Overnight deposits

      63,157        99,933  

Cash on hand

      352        311  
  

 

 

     

 

 

  
   $ 238,792      $ 331,687  
  

 

 

     

 

 

  

As of December 31, 2017 and 2016, the Company’s cash and cash equivalents are free of restriction or charges that could limit its availability.

Time deposits earned interest based on rates determined by the banks in which the instruments are held, ranging between 1.49% and 1.58% for U.S. dollars investments until December 2017 (2016: between 0.42% and 1.00%).