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Additional Balance Sheet Information | 12 Months Ended
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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 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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