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Financial Instruments
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Financial Instruments
10. Financial Instruments
Fair Value Measurements:
Authoritative guidance on fair value measurements defines fair value, establishes a framework for measuring fair value and stipulates the related disclosure requirements. The Company follows a three-level hierarchy, prioritizing and defining the types of inputs used to measure fair value. The fair values of the Company’s interest rate swaps, natural gas and crude oil price collars and swaps are designated as Level 3. The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis at December 31, 2020 and December 31, 2019:​​​​​​​
 
December 31, 2020
  
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,

2020
 
(Thousands of dollars)
                
Assets
        
Commodity derivative contracts
  $ —    $—    $97   $97 
  
 
 
   
 
 
   
 
 
   
 
 
 
Total assets
  $—    $—    $97   $97 
  
 
 
   
 
 
   
 
 
   
 
 
 
Liabilities
        
Commodity derivative contracts
  $—    $—    $(768  $(768
  
 
 
   
 
 
   
 
 
   
 
 
 
Total liabilities
  $—    $—    $(768  $(768
  
 
 
   
 
 
   
 
 
   
 
 
 
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
  
 
 
   
 
 
   
 
 
   
 
 
 
The derivative contracts were measured based on quotes from the Company’s counterparties. Such quotes have been derived using valuation models that consider various inputs including current market and contractual prices for the underlying instruments, quoted forward prices for natural gas and crude oil, volatility factors and interest rates, such as a LIBOR curve for a similar length of time as the derivative contract term as applicable. These estimates are verified using comparable NYMEX futures contracts or are compared to multiple quotes obtained from counterparties for reasonableness.
 
The significant unobservable inputs for Level 3 derivative contracts include basis differentials and volatility factors. An increasee (decrease) in these unobservable inputs would result in an increase (decrease) in fair value, respectively. The Company does not have access to the specific assumptions used in its counterparties’ valuation models. Consequently, additional disclosures regarding significant Level 3 unobservable inputs were not provided.
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 year ended December 2020.
 
(Thousands of dollars)
    
Net Liabilities – December 31, 2019
  $(481
Total realized and unrealized (gains) losses:
  
Included in earnings (a)
   5,983 
Purchases, sales, issuances and settlements
   (6,173
  
 
 
 
Net Liabilities — December 31, 2020
  $(671
  
 
 
 
 
(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.
Derivative Instruments:
The Company is exposed to commodity price and interest rate risk, and management considers periodically the Company’s exposure to cash flow variability resulting from the commodity price changes and interest rate fluctuations. Futures, swaps and options are used to manage the Company’s exposure to commodity price risk inherent in the Company’s oil and gas production operations. The Company does not apply hedge accounting to any of its commodity-based derivatives. Both realized and unrealized gains and losses associated with commodity derivative instruments are recognized in earnings.
The following table sets forth the effect of derivative instruments on the consolidated balance sheets at December 31, 2020 and 2019:
 
       
Fair Value
 
(Thousands of dollars)
  
Balance Sheet Location
   
December 31,

2020
   
December 31,

2019
 
Asset Derivatives:
      
Derivatives not designated as cash-flow hedging instruments:
      
Natural gas commodity contracts
   
Derivative asset short-term
   $—     $ 146 
Natural gas liquid contracts
   Derivative asset short-term    —      —   
Crude oil commodity contracts
   Derivative asset short-term    —      126 
Natural gas commodity contracts
   
Derivative asset long-term and

other assets

 
   97    —   
Crude oil commodity contracts
   
Derivative asset short-term
and other assets
 
 
   —      —   
    
 
 
   
 
 
 
Total
    $97   $272 
    
 
 
   
 
 
 
Liability Derivatives:
      
Derivatives not designated as cash-flow hedging instruments:
      
Crude oil commodity contracts
   Derivative liability short-term   $(428  $(715
Natural gas commodity contracts
   Derivative liability short-term    (296   (38
Natural gas liquid contracts
   Derivative liability short-term    —      —   
Natural gas commodity contracts
   Derivative liability long-term    (44   —   
    
 
 
   
 
 
 
Total
    $(768  $(753
    
 
 
   
 
 
 
Total derivative instruments
    $(671  $(481
    
 
 
   
 
 
 
 
The following table sets forth the effect of derivative instruments on the consolidated statements of operations for the years ended December 31, 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
 
 
  (351   123 
Crude oil commodity contracts
   
Unrealized gain (loss) on
derivative instruments, net
 
 
  161    (2,776
Natural gas liquids contracts
   
Unrealized (loss) on
derivative instruments, net
 
 
  —      (124
Natural gas commodity contracts
   
Realized (loss) gain on
derivative instruments, net
 
 
  476    90 
Crude oil commodity contracts
   
Realized gain (loss) on
derivative instruments, net
 
 
  5,697    (1,814
   
 
 
   
 
 
 
   $ 5,983   $(4,148