PROPERTY, PLANT AND EQUIPMENT - Schedule Of Property, Plant And Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,720,738	$ 3,301,158
Less: Accumulated depreciation	1,771,960	2,090,004
Property, plant and equipment, net	948,778	1,211,154
Structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,294,357	2,832,797
Furniture and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	217,061	234,183
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	149,384	149,889
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 59,936	$ 84,289