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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Revenue $ 1,817,191 $ 1,943,655 $ 2,265,803
Specialty plant nutrition [Member]      
Statement [Line Items]      
Revenue 701,688 723,920 781,751
Sodium Nitrates [Member]      
Statement [Line Items]      
Revenue 18,291 20,679 17,688
Potassium Nitrate And Sodium Potassium Nitrate [Member]      
Statement [Line Items]      
Revenue 424,041 457,477 527,945
Specialty Blends [Member]      
Statement [Line Items]      
Revenue 163,033 153,739 145,511
Other Specialty Fertilizers [Member]      
Statement [Line Items]      
Revenue 96,323 92,025 90,607
Iodine And Derivatives [Member]      
Statement [Line Items]      
Revenue 334,657 371,020 324,972
Lithium and Derivatives [Member]      
Statement [Line Items]      
Revenue 383,373 505,714 734,801
Potassium [Member]      
Statement [Line Items]      
Revenue 209,294 212,151 267,474
Industrial chemicals [Member]      
Statement [Line Items]      
Revenue 160,608 94,875 108,267
Other Products [Member]      
Statement [Line Items]      
Revenue 27,571 35,975 48,538
Income From Services [Member]      
Statement [Line Items]      
Revenue 3,241 3,410 4,017
Income From leasing Of Properties [Member]      
Statement [Line Items]      
Revenue 1,457 1,438 1,474
Income from subleases on right-of-use assets [Member]      
Statement [Line Items]      
Revenue 176 261 0
Commodities [Member]      
Statement [Line Items]      
Revenue 11,938 16,176 18,581
Other Ordinary Income Commercial Offices [Member]      
Statement [Line Items]      
Revenue $ 10,759 $ 14,690 $ 24,466