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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Summary of Financial Assets and Liabilities Measured at Fair Value
Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:
 Fair Value Measurement at September 30, 2023 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$1,928 $— $— 
Interest rate swaps— 16,357 — 
$1,928 $16,357 $— 
Liabilities:
Interest rate swaps— 1,886 — 
$— $1,886 $— 

 Fair Value Measurement at December 31, 2022 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$1,900 $— $— 
Interest rate swaps— 11,806 — 
$1,900 $11,806 $— 
Liabilities:
Contingent consideration - acquisition (1)
$— $— $965 
(1)In the three and nine months ended September 30, 2023, we recorded a gain on resolution of acquisition-related contingent consideration of $376 and $965, respectively, within cost of operations associated with the reversal of a contingency for a transfer station permit expansion that is no longer deemed viable.