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Additional Balance Sheet Information | 12 Months Ended
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Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Additional Balance Sheet Information | 3. Additional Balance Sheet Information Accounts receivable at December 31, 2016 and 2015 consisted of the following:
|  | December 31, |
(Thousands of dollars) |  | 2016 |  |  | 2015 |
Joint interest billings |  | $ | 2,345 |  |  | $ | 2,667 |
Trade receivables |  |  | 1,070 |  |  |  | 1,452 |
Oil and gas sales |  |  | 4,078 |  |  |  | 3,576 |
Other |  |  | 204 |  |  |  | 2,377 |
|  |  | 7,697 |  |  |  | 10,072 |
Less: Allowance for doubtful accounts |  |  | (297 | ) |  |  | (529 | )
Total |  | $ | 7,400 |  |  | $ | 9,543 |
Accounts payable at December 31, 2016 and 2015 consisted of the following:
|  | December 31, |
(Thousands of dollars) |  | 2016 |  |  | 2015 |
Trade |  | $ | 3,967 |  |  | $ | 3,289 |
Royalty and other owners |  |  | 5,909 |  |  |  | 5,973 |
Partner advances |  |  | 592 |  |  |  | 1,083 |
Prepaid drilling deposits |  |  | 83 |  |  |  | 390 |
Other |  |  | 1,414 |  |  |  | 1,620 |
Total |  | $ | 11,965 |  |  | $ | 12,355 |
Accrued liabilities at December 31, 2016 and 2015 consisted of the following:
|  | December 31, |
(Thousands of dollars) |  | 2016 |  |  | 2015 |
Compensation and related expenses |  | $ | 2,295 |  |  | $ | 2,294 |
Property costs |  |  | 3,317 |  |  |  | 3,302 |
Income tax |  |  | 1,988 |  |  |  | — |
Other |  |  | 584 |  |  |  | 526 |
Total |  | $ | 8,184 |  |  | $ | 6,122 |

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