REMEDIAL LIABILITIES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2019	$ 121,017
Accretion	2,292
Changes in estimates recorded to statement of operations	(855)
Expenditures	(4,596)
Currency translation and other	417
Balance at June 30, 2019	118,275
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2019	1,838
Accretion	44
Changes in estimates recorded to statement of operations	23
Expenditures	(29)
Currency translation and other	0
Balance at June 30, 2019	1,876
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2019	65,315
Accretion	1,359
Changes in estimates recorded to statement of operations	171
Expenditures	(2,445)
Currency translation and other	24
Balance at June 30, 2019	64,424
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1, 2019	53,864
Accretion	889
Changes in estimates recorded to statement of operations	(1,049)
Expenditures	(2,122)
Currency translation and other	393
Balance at June 30, 2019	$ 51,975