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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Revenue $ 1,943,655 $ 2,265,803 $ 2,157,323
Specialty plant nutrition [Member]      
Statement [Line Items]      
Revenue 723,920 781,751 697,251
Sodium Nitrates [Member]      
Statement [Line Items]      
Revenue 20,679 17,688 18,555
Potassium Nitrate And Sodium Potassium Nitrate [Member]      
Statement [Line Items]      
Revenue 457,477 527,945 474,451
Specialty Blends [Member]      
Statement [Line Items]      
Revenue 153,739 145,511 121,263
Other Specialty Fertilizers [Member]      
Statement [Line Items]      
Revenue 92,025 90,607 82,982
Iodine And Derivatives [Member]      
Statement [Line Items]      
Revenue 371,020 324,972 252,123
Lithium and Derivatives [Member]      
Statement [Line Items]      
Revenue 505,714 734,801 644,573
Potassium [Member]      
Statement [Line Items]      
Revenue 212,151 267,474 403,323
Industrial chemicals [Member]      
Statement [Line Items]      
Revenue 94,875 108,267 135,578
Other Products [Member]      
Statement [Line Items]      
Revenue 35,975 48,538 48,472
Income From Services [Member]      
Statement [Line Items]      
Revenue 3,410 4,017 3,795
Income From leasing Of Properties [Member]      
Statement [Line Items]      
Revenue 1,438 1,474 71
Income from subleases on right-of-use assets [Member]      
Statement [Line Items]      
Revenue 261 0 0
Commodities [Member]      
Statement [Line Items]      
Revenue 16,176 18,581 11,822
Other Ordinary Income Commercial Offices [Member]      
Statement [Line Items]      
Revenue $ 14,690 $ 24,466 $ 32,784