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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018 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
$
1,248

 
$

 
$

Interest rate swaps

 
820

 

 
$
1,248

 
$
820

 
$

Liabilities:
 
 
 
 
 
Interest rate swaps
$

 
$
1,942

 
$


 
Fair Value Measurement at December 31, 2017 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
$
1,220

 
$

 
$

Interest rate swaps

 
401

 

 
$
1,220

 
$
401

 
$

Liabilities:
 
 
 
 
 
Interest rate swaps
$

 
$
123

 
$