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Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis at September 30, 2020 and December 31, 2019:
September 30, 2020
  
Quoted Prices in
Active Markets
For Identical
Assets (Level 1)
   
Significant
Other
Observable
Inputs (Level 2)
   
Significant

Unobservable
Inputs (Level 3)
   
Balance at

September
30, 2020
 
(Thousands of dollars)
        
Assets
        
Commodity derivative contracts
  $—     $—     $223   $223 
  
 
 
   
 
 
   
 
 
   
 
 
 
Total assets
   —     $—     $223   $223 
  
 
 
   
 
 
   
 
 
   
 
 
 
Liabilities
        
Commodity derivative contracts
  $—     $—     $(766  $(766
Total liabilities
  $—     $—     $(766  $(766
  
 
 
   
 
 
   
 
 
   
 
 
 
 
December 31, 2019
  
Quoted Prices in
Active Markets
For Identical
Assets (Level 1)
   
Significant
Other
Observable
Inputs (Level 2)
   
Significant
Unobservable
Inputs (Level 3)
   
Balance at
December 31,
2019
 
  
 
 
   
 
 
   
 
 
   
 
 
 
(Thousands of dollars)
        
Assets
        
Commodity derivative contracts
  $—     $—     $272   $272 
  
 
 
   
 
 
   
 
 
   
 
 
 
Total assets
  $—     $—     $272   $272 
  
 
 
   
 
 
   
 
 
   
 
 
 
Liabilities
        
Commodity derivative contract
  $—     $—     $(753  $(753
Total liabilities
  $—     $—     $(753  $(753
  
 
 
   
 
 
   
 
 
   
 
 
 
Schedule of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3
The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the period ended September 30, 2020.
 
(Thousands of dollars)
  
Net Liability– December 31, 2019
  $(481
Total realized and unrealized (gains) losses:
  
Included in earnings (a)
   6,114 
Purchases, sales, issuances and settlements
   (6,176
Net Liability September 30, 2020
  $(543
  
 
 
 
 
 
a)
Derivative instruments are reported in revenues as realized gain (loss) and on a separately reported line item captioned unrealized gain (loss) on derivative instruments.
Effect of Derivative Instruments on Consolidated Balance Sheets
The following table sets forth the effect of derivative instruments on the consolidated balance sheets at September 30, 2020 and December 31, 2019:
 
      
Fair Value
 
(Thousands of dollars)
  
Balance Sheet Location
  
September 30,

2020
   
December 31,

2019
 
Asset Derivatives:
      
Derivatives not designated as cash-flow hedging instruments:
      
Natural gas commodity contracts
  Derivative asset short-term  $—     $146 
Crude oil commodity contracts
  Derivative asset short-term   131    126 
Natural gas commodity contracts
  Derivative asset long-term   92    —   
    
 
 
   
 
 
 
Total
    $223   $272 
    
 
 
   
 
 
 
Liability Derivatives:
      
Derivatives not designated as cash-flow hedging instruments:
      
Crude oil commodity contracts
  Derivative liability short-term  $(206  $(715
Natural gas commodity contracts
  Derivative liability short-term   (442   (38
Natural gas commodity contracts
  Derivative liability long-term   (118   —   
    
 
 
   
 
 
 
Total
    $(766  $(753
    
 
 
   
 
 
 
Total derivative instruments
    $(543  $(481
    
 
 
   
 
 
 
Effect of Derivative Instruments on Consolidated Statements of Operations
The following table sets forth the effect of derivative instruments on the consolidated statements of operations for the nine months ended September 30, 2020 and 2019:
 
   
Location of gain (loss) recognized in income
  
Amount of gain/loss

recognized in income
 
(Thousands of dollars)
  
2020
  
2019
 
Derivatives not designated as cash-flow hedge instruments:
     
Natural gas commodity contracts
  Unrealized gain on derivative instruments, net  $533  $82 
Crude oil commodity contracts
  Unrealized gain (loss) on derivative instruments, net   5,643   (900
Natural gas liquids contract
s
  Unrealized loss on derivative instruments, net   —     (1
Natural gas commodity contracts
  
Realized gain (loss) on derivative instruments, net
   (576  90 
Crude oil commodity contracts
  
Realized gain (loss) on derivative instruments, net
   514   (1,302
Natural gas liquids contracts
  Realized gain on derivative instruments, net   —     244 
    
 
 
  
 
 
 
    $6,114  $(1,787