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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021 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$1,948 $— $— 
Interest rate swaps— 228 — 
$1,948 $228 $— 
Liabilities:
Interest rate swaps$— $7,604 $— 

 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 $—