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Additional Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Components of Balance Sheet Amounts

Accounts receivable at December 31, 2016 and 2015 consisted of the following:

 

     December 31,  

(Thousands of dollars)

    2016      2015  

Joint interest billings

    $ 2,345      $ 2,667  

Trade receivables

      1,070        1,452  

Oil and gas sales

      4,078        3,576  

Other

      204        2,377  
  

 

 

     

 

 

  
     7,697        10,072  

Less: Allowance for doubtful accounts

      (297 )       (529 ) 
  

 

 

     

 

 

  

Total

    $ 7,400      $ 9,543  
  

 

 

     

 

 

  

 

Accounts payable at December 31, 2016 and 2015 consisted of the following:

 

     December 31,  

(Thousands of dollars)

    2016      2015  

Trade

    $ 3,967      $ 3,289  

Royalty and other owners

      5,909        5,973  

Partner advances

      592        1,083  

Prepaid drilling deposits

      83        390  

Other

      1,414        1,620  
  

 

 

     

 

 

  

Total

    $ 11,965      $ 12,355  
  

 

 

     

 

 

  

Accrued liabilities at December 31, 2016 and 2015 consisted of the following:

 

     December 31,  

(Thousands of dollars)

    2016      2015  

Compensation and related expenses

    $ 2,295      $ 2,294  

Property costs

      3,317        3,302  

Income tax

      1,988        —    

Other

      584        526  
  

 

 

     

 

 

  

Total

    $ 8,184      $ 6,122