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Joint Ventures (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments accounted for using equity method |  | $ 146,425 | $ 133,140 | $ 29,466
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | 1,448 | 2,855 | 97
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | (51) | 2,845 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | 717 | 5,458 | 341
SQM Vitas Spain [Member] |  |  |  |
Investments accounted for using equity method |  | 0 | 0 | 1,182
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | 0 | 0 | (251)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 | 0 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ 0 | 0 | 109
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member] |  |  |  |
Name of joint venture |  | Sichuan SQM Migao Chemical Fertilizers Co Ltda. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 11,444 | 12,150 | 13,257
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | (535) | (1,372) | (845)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 | 0 | (12)
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ (535) | (1,372) | (857)
Coromandel SQM India [Member] |  |  |  |
Name of joint venture |  | Coromandel SQM India |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 1,633 | 1,499 | 962
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | 165 | 435 | 88
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 | 0 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ 165 | 435 | 88
SQM Vitas Fzco. [Member] |  |  |  |
Name of joint venture |  | SQM Vitas Fzco. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 19,478 | 17,956 | 11,604
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | 1,502 | 3,458 | 369
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | (5) | 449 | 9,686
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ 1,497 | 3,907 | 10,055
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member] |  |  |  |
Name of joint venture |  | SQM Star Qingdao Corp Nutrition Co., Ltd. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 2,980 | 2,618 | 2,462
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | 361 | 163 | 495
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 | 0 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ 361 | 163 | 495
SQM Vitas Brazil Agroindustria [Member] |  |  |  |
Name of joint venture |  | SQM Vitas Brazil Agroindustria |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 11,003 | 9,343 | 3,722
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | 1,753 | 4,570 | (72)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | (51) | 2,845 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ 826 | 5,130 | (36)
SQM Vitas Southern Africa Pty. [Member] |  |  |  |
Name of joint venture |  | SQM Vitas Southern Africa Pty. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
SQM Vitas Peru S.A.C. [Member] |  |  |  |
Name of joint venture |  | SQM Vitas Perú S.A.C. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 5,961 | 5,964 | 5,061
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | (216) | 815 | 786
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 | 0 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ (108) | 408 | 393
SQM Vitas Plantacote B.V [Member] |  |  |  |
Name of joint venture |  | SQM Vitas Plantacote B.V. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method | [1] | $ 669 | 588 | 3,598
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method | [1] | (1) | 187 | 215
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 | 0 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ (1) | (80) | (125)
Minera Exar S.A. [Member] |  |  |  |
Name of joint venture |  | Minera Exar S.A. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 26,860 | 25,000 | 0
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | (27) | 0 | 0
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 |  |
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ (27) | 0 |
SQM Vitas Holland [Member] |  |  |  |
Name of joint venture |  | SQM Vitas Holland B.V. |  |
Date of end of reporting period of financial statements of joint venture |  | Dec. 31, 2017 |  |
Description of whether investment in joint venture is measured using equity method or at fair value |  | Equity method |  |
Investments accounted for using equity method |  | $ 1,429 | 1,269 | 1,181
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | (18) | 171 | (10)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | 0 | 0 | 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | (18) | 171 | (11)
Joint ventures [member] |  |  |  |
Investments accounted for using equity method |  | 17,633 | 15,895 | 13,563
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method |  | 1,536 | 5,572 | 678
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax |  | (5) | 449 | 9,674
Share of total comprehensive income of associates and joint ventures accounted for using equity method |  | $ 1,443 | $ 3,304 | $ 9,770
[1] | SQM Vitas Holland

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