Materials and supplies

12 Months Ended

Dec. 31, 2017

Materials and supplies [Abstract]

Materials and supplies

9 Materials and supplies

Materials and supplies at December 31, 2017 and 2016, are summarized as follows:

	2017		2016
Spare parts	$	43,335	$	75,909
Fuels		14,361		29,722
Others		365		669
	$	58,061	$	106,300