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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 7) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Net impairment (losses) gains on reversal of financial assets $ 4,684 $ (1,057) $ 2,967
Investments In Associates [Member]      
Statement [Line Items]      
Net impairment (losses) gains on reversal of financial assets $ 4,684 $ (1,057) $ 2,967