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Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Liabilities Disclosure [Abstract] |
Schedule of Other Long-Term Liabilities and Deferred Credits | Other long-term liabilities and deferred credits on the balance sheet consisted of:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (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.

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- Definition Schedule of other long-term liabilities and deferred credits table text block + References No definition available. + Details
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