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PROPERTY, PLANT AND EQUIPMENT (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 3,745,045 | $ 3,699,416
Less - accumulated depreciation and amortization | 2,217,101 | 2,174,118
Total property, plant and equipment, net | 1,527,944 | 1,525,298
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 145,662 | 139,776
Asset retirement costs (non-landfill) |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 17,747 | 16,407
Landfill assets |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 193,009 | 191,687
Buildings and improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 514,711 | 509,804
Right-of-Use assets, finance leases | 8,900 | 8,900
Camp equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 158,281 | 159,021
Vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 855,842 | 844,026
Right-of-Use assets, finance leases | 56,400 | 47,200
Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 1,812,858 | 1,807,235
Right-of-Use assets, finance leases | 9,400 | 9,300
Furniture and fixtures |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 6,992 | 7,082
Construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 39,943 | $ 24,378

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