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LEASES - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost	$ 3,684,008	$ 2,925,808
Less accumulated depreciation, depletion and amortization	(1,675,022)	(1,513,450)
Total property, plant and equipment, net	2,008,986	1,412,358
Assets under finance lease
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost	30,610	141,019
Less accumulated depreciation, depletion and amortization	(20,564)	(74,576)
Total property, plant and equipment, net	$ 10,046	$ 66,443

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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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