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PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, gross	$ 1,329,952	$ 1,124,602
Accumulated depreciation	(489,927)	(462,128)
Impairment	(30,503)	(7,933)
Property, plant and equipment, excluding construction in process, net	809,522	654,541
Construction in process	75,464	92,694
Property, plant and equipment, net	884,986	747,235
Buildings
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, gross	441,975	340,215
Leasehold improvements
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, gross	13,058	11,498
Machinery
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, gross	785,874	698,150
Furniture, fixtures and equipment
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, gross	64,135	50,310
Motor vehicles
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, gross	6,100	5,782
Land
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, gross	18,810	18,647
Property, plant and equipment
PROPERTY, PLANT AND EQUIPMENT, NET
Depreciation expense	$ 120,834	$ 88,931	$ 72,813

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Amount of accumulated asset impairment for physical assets used in the normal conduct of business to produce goods and services.

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Represents the net amount of long-lived physical assets, excluding construction in process, used in the normal conduct of business and not intended for resale.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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