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POST-RETIREMENT BENEFITS - Other Post-Retirement Benefits (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) year | Dec. 31, 2016 USD ($) year
Disclosure of net defined benefit liability (asset) [line items] |  |
Weighted average duration of defined benefit obligation | year | 10 | 10
Estimate of contributions, Less than a year | $ 15 | $ 19
Estimate of contributions, between 1-2 years | 15 | 20
Estimate of contributions, between 2-5 years | 41 | 56
Estimate of contributions, over 5 years | 205 | 319
Total | 276 | 414
Defined pension benefits |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Estimate of contributions, Less than a year | 14 | 18
Estimate of contributions, between 1-2 years | 14 | 19
Estimate of contributions, between 2-5 years | 39 | 54
Estimate of contributions, over 5 years | 200 | 313
Total | 267 | 404
Other post-retirement benefits |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Estimate of contributions, Less than a year | 1 | 1
Estimate of contributions, between 1-2 years | 1 | 1
Estimate of contributions, between 2-5 years | 2 | 2
Estimate of contributions, over 5 years | 5 | 6
Total | $ 9 | $ 10

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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