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COMMITMENTS AND CONTINGENCIES - Southbridge Landfill Environmental Remediation Liability (Details) - Southbridge Landfill - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 5,173	$ 5,936
Accretion expense	65	78
Obligations settled	(392)	(441)
Ending balance	$ 4,846	$ 5,573

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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- Definition

Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

+ References

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Amount of cash outflow to settle environmental loss contingencies.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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