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Additional Balance Sheet Information | 12 Months Ended
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Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Additional Balance Sheet Information | 3. Additional Balance Sheet Information Accounts receivable at December 31, 2015 and 2014 consisted of the following:
|  | December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Joint interest billings |  | $ | 2,667 |  |  | $ | 2,882 |
Trade receivables |  |  | 1,452 |  |  |  | 1,980 |
Oil and gas sales |  |  | 3,576 |  |  |  | 6,245 |
Other |  |  | 2,377 |  |  |  | 1,751 |
|  |  | 10,072 |  |  |  | 12,858 |
Less: Allowance for doubtful accounts |  |  | (529 | ) |  |  | (543 | )
Total |  | $ | 9,543 |  |  | $ | 12,315 |
Accounts payable at December 31, 2015 and 2014 consisted of the following:
|  | December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Trade |  | $ | 3,289 |  |  | $ | 3,995 |
Royalty and other owners |  |  | 5,973 |  |  |  | 8,444 |
Partner advances |  |  | 1,083 |  |  |  | 1,344 |
Prepaid drilling deposits |  |  | 390 |  |  |  | 786 |
Other |  |  | 1,620 |  |  |  | 1,689 |
Total |  | $ | 12,355 |  |  | $ | 16,258 |
Accrued liabilities at December 31, 2015 and 2014 consisted of the following:
|  | December 31, |
(Thousands of dollars) |  | 2015 |  |  | 2014 |
Compensation and related expenses |  | $ | 2,294 |  |  | $ | 2,350 |
Property costs |  |  | 3,302 |  |  |  | 9,204 |
Income tax |  |  | — |  |  |  | 554 |
Other |  |  | 526 |  |  |  | 293 |
Total |  | $ | 6,122 |  |  | $ | 12,401 |

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