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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The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
PROPERTY AND EQUIPMENT
Total property and equipment	$ 751,546		$ 733,358
Accumulated depreciation and amortization	(266,221)		(254,590)
Property and equipment, net	485,325		478,768
Depreciation and amortization of plant and equipment	17,978	$ 8,125
Cell development costs
PROPERTY AND EQUIPMENT
Total property and equipment	173,787		174,561
Land and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	53,004		52,909
Buildings and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	111,539		109,580
Railcars
PROPERTY AND EQUIPMENT
Total property and equipment	17,299		17,299
Vehicles, vessels and other equipment
PROPERTY AND EQUIPMENT
Total property and equipment	324,177		317,472
Construction in progress
PROPERTY AND EQUIPMENT
Total property and equipment	$ 71,740		$ 61,537