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Assets held for sale (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets held for sale [Line Items] |  |  |
Share in the profits (losses) of associates and joint ventures accounted for using the equity method | $ 6,351 | $ 14,452 | $ 13,047
Income before tax | 621,038 | 594,590 | 414,889
Cash detail from Sale of Investments |  |  |
Net cash generated from operating activities | 524,839 | 758,272 | 633,662
Net cash generated from investment activities | (187,004) | $ (248,067) | $ 162,386
Classification of assets as held for sale [member] |  |  |
Assets held for sale [Line Items] |  |  |
Share in the profits (losses) of associates and joint ventures accounted for using the equity method | 110 |  |
Income before tax | 110 |  |
Cash detail from Sale of Investments |  |  |
Net cash generated from operating activities | 13,232 |  |
Net cash generated from investment activities | 68,988 |  |
Net increase in cash generated by sales of investments | 82,220 |  |
Minera Exar S.A. [Member] | Classification of assets as held for sale [member] |  |  |
Assets held for sale [Line Items] |  |  |
Share in the profits (losses) of associates and joint ventures accounted for using the equity method | (206) |  |
Income before tax | (206) |  |
Cash detail from Sale of Investments |  |  |
Net cash generated from operating activities | 13,232 |  |
Net cash generated from investment activities | 68,000 |  |
Net increase in cash generated by sales of investments | 81,232 |  |
Charlee SQM Thailand Co. Ltd. [Member] | Classification of assets as held for sale [member] |  |  |
Assets held for sale [Line Items] |  |  |
Share in the profits (losses) of associates and joint ventures accounted for using the equity method | 316 |  |
Income before tax | 316 |  |
Cash detail from Sale of Investments |  |  |
Net cash generated from operating activities | 0 |  |
Net cash generated from investment activities | 988 |  |
Net increase in cash generated by sales of investments | $ 988 |  |

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