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Additional Balance Sheet Information
12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Additional Balance Sheet Information

3. Additional Balance Sheet Information

Accounts receivable at December 31, 2017 and 2016 consisted of the following:

 

     December 31,  

(Thousands of dollars)

   2017      2016  

Joint interest billings

   $ 3,173      $ 2,345  

Trade receivables

     941        1,070  

Oil and gas sales

     12,941        4,078  

Other

     4        204  
  

 

 

    

 

 

 
     17,059        7,697  

Less: Allowance for doubtful accounts

     (98      (297
  

 

 

    

 

 

 

Total

   $ 16,961      $ 7,400  
  

 

 

    

 

 

 

 

Accounts payable at December 31, 2017 and 2016 consisted of the following:

 

     December 31,  

(Thousands of dollars)

   2017      2016  

Trade

   $ 14,317      $ 3,967  

Royalty and other owners

     7,073        5,909  

Partner advances

     1,268        592  

Prepaid drilling deposits

     67        83  

Other

     1,890        1,414  
  

 

 

    

 

 

 

Total

   $ 24,615      $ 11,965  
  

 

 

    

 

 

 

Accrued liabilities at December 31, 2017 and 2016 consisted of the following:

 

     December 31,  

(Thousands of dollars)

   2017      2016  

Compensation and related expenses

   $ 2,449      $ 2,295  

Property costs

     9,141        3,317  

Income tax

     4,180        1,988  

Other

     524        584  
  

 

 

    

 

 

 

Total

   $ 16,294      $ 8,184