PROPERTY, PLANT AND EQUIPMENT (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 3,259,929	$ 3,190,573
Less - accumulated depreciation and amortization	1,628,281	1,603,208
Total property, plant and equipment, net	1,631,648	1,587,365
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	124,331	121,658
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	14,794	14,593
Landfill assets
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	145,177	144,539
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	421,749	414,384
Camp equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	165,104	170,012
Vehicles
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	676,749	617,959
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	1,659,335	1,644,102
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	5,656	5,708
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 47,034	$ 57,618