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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis
Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis are as follows:
 Fair Value Measurement at December 31, 2020 Using:
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable Inputs
(Level 3)
Assets:
Restricted investment securities - landfill closure$1,848 $— $— 
Liabilities:
Interest rate swaps$— $13,237 $— 

Fair Value Measurement at December 31, 2019 Using:
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable Inputs
(Level 3)
Assets:
Restricted investment securities - landfill closure$1,586 $— $— 
Liabilities:
Interest rate swaps$— $5,427 $—