REMEDIAL LIABILITIES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2021	$ 114,813
Accretion	2,201
Changes in estimates recorded to consolidated statement of operations	145
Expenditures	(5,112)
Currency translation and other	407
Balance at June 30, 2021	112,454
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2021	1,865
Accretion	45
Changes in estimates recorded to consolidated statement of operations	(22)
Expenditures	(24)
Currency translation and other	0
Balance at June 30, 2021	1,864
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2021	63,060
Accretion	1,320
Changes in estimates recorded to consolidated statement of operations	312
Expenditures	(2,833)
Currency translation and other	(805)
Balance at June 30, 2021	61,054
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2021	49,888
Accretion	836
Changes in estimates recorded to consolidated statement of operations	(145)
Expenditures	(2,255)
Currency translation and other	1,212
Balance at June 30, 2021	$ 49,536