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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowances for accounts receivable, trade
Movement of allowances
Beginning of the year	$ 28,156	$ 31,817	$ 38,483
Allowances made (reversed) during the year, net	(854)	(1,084)	(5,843)
Accounts written-off against allowances	(47)	(858)	(9)
Foreign exchange effect	(1,136)	(1,719)	(814)
Closing balance	26,119	28,156	31,817
Allowances for advances to suppliers
Movement of allowances
Beginning of the year	28,629	37,735	40,047
Allowances made (reversed) during the year, net	(5,427)	1,291	4
Accounts written-off against allowances	(3,644)	(9,465)
Foreign exchange effect	(31)	(932)	(2,316)
Closing balance	19,527	28,629	37,735
Allowances for other receivables
Movement of allowances
Beginning of the year	3,885	830	887
Allowances made (reversed) during the year, net	5,954	3,257	(53)
Foreign exchange effect	(588)	(202)	(4)
Closing balance	$ 9,251	$ 3,885	$ 830

X

- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs which have been charged to costs and expenses net of the total of recoveries of amounts due the Entity that had previously been written off as uncollectible using allowances (the valuation accounts that are netted against the cost of an asset to value it at its carrying value) and total of reestablishments of reserves (liabilities established to represent expected future costs) that had previously been utilized.

+ References

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- Definition

Total of the foreign exchange effects in a given period to allowances or reserves.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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