REMEDIAL LIABILITIES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 124,468
Accretion	2,349
Changes in estimates recorded to statement of operations	(758)
Expenditures	(4,138)
Currency translation and other	(646)
Balance at end of year	121,275
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	1,800
Accretion	43
Changes in estimates recorded to statement of operations	0
Expenditures	(23)
Currency translation and other	0
Balance at end of year	1,820
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	65,342
Accretion	1,375
Changes in estimates recorded to statement of operations	83
Expenditures	(1,939)
Currency translation and other	882
Balance at end of year	65,743
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	57,326
Accretion	931
Changes in estimates recorded to statement of operations	(841)
Expenditures	(2,176)
Currency translation and other	(1,528)
Balance at end of year	$ 53,712