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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Total $ (5,313) $ (383) $ 6,404
Other income expenses [Member]      
Statement [Line Items]      
Adjustment relating to previous year application of equity method to investments (49) (985) (664)
Losses in the sale of investments in associates (11,830) 0 (759)
Impairment of interests in associates 7,235 631 (8,802)
Losses in the sale of investments in joint Ventures (481) 0 14,507
Others (188) (29) 2,122
Total $ (5,313) $ (383) $ 6,404