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Other Long-Term Liabilities
 12 Months Ended
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]  
Other Long-Term Liabilities

8. OTHER LONG-TERM LIABILITIES

 

Other long-term liabilities and deferred credits on the balance sheet consisted of:

 

    December 31,  
    2017     2016  
    (thousands of dollars)  
Royalties payable(1)   $ 500     $ 500  
    $ 500     $ 500  

 

  (1) Royalties payable were derived during prior years of production. Liabilities do not accrue interest or have a stated maturity date.