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Effect of fluctuations in foreign currency exchange rates (Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | $ (24,913) | $ (19,463) | $ (14,035)
Comercial Hydro S.A. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | 1,004 | 1,004 | 1,004
SQMC Internacional Ltda. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (2) | (13) | (20)
Proinsa Ltda. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (7) | (10) | (15)
Comercial Agrorama Ltda. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (44) | (69) | (100)
Isapre Norte Grande Ltda. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (74) | (124) | (155)
Almacenes y Depositos Ltda. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | 97 | 47 | (31)
Sales de Magnesio Ltda. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | 0 | (29) | (161)
Sociedad Prestadora de Servicios de Salud Cruz del Norte S.A. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | 0 | (6) | (9)
Agrorama S.A. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (98) | (49) | (35)
Doktor Tarsa [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (14,447) | (12,264) | (8,305)
SQM Vitas Fzco. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (1,779) | (1,801) | (2,245)
Ajay Europe [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (831) | (1,935) | (1,731)
SQM Eastmed Turkey [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (92) | (95) | (81)
Charlee SQM Thailand Co. Ltd. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (285) | (460) | (476)
Coromandel SQM India [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (234) | (282) | (301)
SQM Italia SRL [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (154) | (287) | (250)
SQM Oceania Pty Limited [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (634) | (634) | (634)
SQM Indonesia S.A. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (124) | (124) | (123)
Abu Dhabi Fertilizers Industries WWL [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (435) | (434) | 21
SQM Vitas Holland [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (101) | (280) | (320)
SQM Thailand Limited [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (68) | (68) | (68)
SQM Europe N.V. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (1,550) | (1,550) | 0
Minera Exar S.A. [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | (5,209) | 0 | 0
SQM Australia Pty Ltd [Member] |  |  |
Other reserves [abstract] |  |  |
Reserve of exchange differences on translation | $ 154 | $ 0 | $ 0

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