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Income tax and deferred taxes (Details 9) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income tax related to other income and expense components with a charge or credit to net equity      
Gain (loss) from defined benefit plans $ (702) $ (396) $ (282)
Cash flow hedge 2,683 0 0
Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income 0 0 550
Total (2,543) 744 489
Amount before taxes (expense) gain [Member]      
Income tax related to other income and expense components with a charge or credit to net equity      
Gain (loss) from defined benefit plans (3,310) (1,327) (1,401)
Cash flow hedge 1,907 5,723 2,184
Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income 1,152 (5,546) (26)
Total (251) (1,150) 757
Gains Losses For Income Taxes [Member]      
Income tax related to other income and expense components with a charge or credit to net equity      
Gain (loss) from defined benefit plans 702 396 282
Cash flow hedge (2,683) 0 0
Reserve for gains (losses) from financial assets measured at fair value through other comprehensive income (311) 1,498 (550)
Total $ (2,292) $ 1,894 $ (268)