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Additional Balance Sheet Information (Tables)
6 Months Ended
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Components of Balance Sheet Amounts
Certain balance sheet amounts are comprised of the following:
 
(Thousands of dollars)
 
June 30,
2019
  
December 31,
2018
 
Accounts Receivable
:
        
Joint interest billing
 $2,303  $1,976 
Trade receivables
  2,725   1,979 
Oil and gas sales
  11,131   6,112 
Tax refund receivable
  —     4,760 
Other
  913   358 
  
 
 
  
 
 
 
   17,072   15,185 
Less: Allowance for doubtful accounts
  (224  (224
  
 
 
  
 
 
 
Total
 $16,848  $14,961 
  
 
 
  
 
 
 
Accounts Payable:
        
Trade
 $5,399  $1,174 
Royalty and other owners
  5,742   6,197 
Partner advances
  1,335   1,357 
Other
  964   825 
  
 
 
  
 
 
 
Total
 $13,440  $9,553 
  
 
 
  
 
 
 
Accrued Liabilities:
        
Compensation and related expenses
 $3,161  $2,907 
Property costs
  3,606   14,993 
Other
  —     531 
  
 
 
  
 
 
 
Total
 $6,767  $18,431