v3.8.0.1

Cash and cash equivalents (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Cash and cash equivalents [abstract] |  |  |  |
Cash and cash equivalents | $ 669,387 | $ 594,811 | $ 514,712 | $ 354,154
Cash held to satisfy the requirements of non-recourse debt agreements | 263,000 |  |  |
U.S. Dollar [Member] |  |  |  |
Cash and cash equivalents [abstract] |  |  |  |
Cash and cash equivalents | 319,400 | 343,954 |  |
Euro [Member] |  |  |  |
Cash and cash equivalents [abstract] |  |  |  |
Cash and cash equivalents | 288,625 | 196,382 |  |
Algerian Dinar [Member] |  |  |  |
Cash and cash equivalents [abstract] |  |  |  |
Cash and cash equivalents | 13,628 | 10,736 |  |
South African Rand [Member] |  |  |  |
Cash and cash equivalents [abstract] |  |  |  |
Cash and cash equivalents | 40,999 | 39,689 |  |
Others [Member] |  |  |  |
Cash and cash equivalents [abstract] |  |  |  |
Cash and cash equivalents | $ 6,735 | $ 4,050 |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2016-01-13 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2016-03-30&anchor=para_45&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard -URIDate 2016-03-31 + Details
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