REMEDIAL LIABILITIES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	$ 114,173
Accretion	1,036
Changes in estimates recorded to statement of operations	(643)
Expenditures	(2,594)
Currency translation and other	(1,108)
Balance at March 31, 2020	110,864
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	1,851
Accretion	22
Changes in estimates recorded to statement of operations	1
Expenditures	(15)
Currency translation and other	0
Balance at March 31, 2020	1,859
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	61,991
Accretion	599
Changes in estimates recorded to statement of operations	(362)
Expenditures	(1,256)
Currency translation and other	(43)
Balance at March 31, 2020	60,929
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2020	50,331
Accretion	415
Changes in estimates recorded to statement of operations	(282)
Expenditures	(1,323)
Currency translation and other	(1,065)
Balance at March 31, 2020	$ 48,076