TRADE ACCOUNTS AND OTHER RECEIVABLES (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Accounts Receivable, Net [Abstract]
Trade accounts receivable		$ 526,063	$ 548,472
Notes receivable - current		4,630	5,130
Other receivables		36,888	20,021
Receivables, gross		567,581	573,623
Allowance for doubtful accounts	$ (8,145)	(8,022)	(8,145)
Receivables, net		559,559	565,478
Account receivable from related parties		$ 652	$ 2,951
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	(8,145)
Provision charged to operating results	(1,398)
Account write-offs and recoveries	1,629
Effect of exchange rate	(108)
Balance, end of period	$ (8,022)

Allowance for Doubtful Accounts Receivable, Foreign Currency Gain (Loss)

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Allowance for Doubtful Accounts Receivable, (Write-offs) Recoveries

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, related party accounts receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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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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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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Amount, before allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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