INVENTORIES - Composition of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of inventories [Abstract]
Raw materials	$ 52,157	$ 36,396
Work in process	30,017	20,207
Finished goods	88,307	71,630
Parts and supplies	20,194	18,571
Current inventories	$ 190,675	$ 146,804

A classification of current inventory representing the amount of goods that have completed the production process and are held for sale in the ordinary course of business. [Refer: Inventories]

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The amount of current inventories. [Refer: Inventories]

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A classification of current inventory representing the amount of assets to be consumed in the production process or in the rendering of services. [Refer: Inventories]

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A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories]

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Current Parts and Supplies

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Disclosure of inventories [Abstract]

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