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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of 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