XML 201 R187.htm IDEA: XBRL DOCUMENT v3.8.0.1
Finance costs and finance revenues (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of business combination [Line Items]      
Beginning balance $ 19,343 $ 16,994 $ 23,026
Variation of the fair value in results (1,773) 2,349 (6,032)
Final balance $ 17,570 $ 19,343 $ 16,994