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Other Long-Term Liabilities | 12 Months Ended
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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.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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