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Additional Balance Sheet Information | 6 Months Ended
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Jun. 30, 2013
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Additional Balance Sheet Information | (4) Additional Balance Sheet Information: Certain balance sheet amounts are comprised of the following:
(Thousands of dollars) |  | June 30, 2013 |  |  | December 31, 2012 |
Accounts Receivable: |  |  |  |  |  |  |  |
Joint interest billing |  | $ | 4,971 |  |  | $ | 2,189 |
Trade receivables |  |  | 2,277 |  |  |  | 1,580 |
Oil and gas sales |  |  | 10,283 |  |  |  | 9,362 |
Other |  |  | 715 |  |  |  | 436 |
|  |  | 18,246 |  |  |  | 13,567 |
Less: Allowance for doubtful accounts |  |  | (327 | ) |  |  | (355 | )
Total |  | $ | 17,919 |  |  | $ | 13,212 |
Accounts Payable: |  |  |  |  |  |  |  |
Trade |  | $ | 1,906 |  |  | $ | 3,968 |
Royalty and other owners |  |  | 9,162 |  |  |  | 9,652 |
Prepaid drilling deposits |  |  | 417 |  |  |  | 306 |
Other |  |  | 5,862 |  |  |  | 5,642 |
Total |  | $ | 17,347 |  |  | $ | 19,568 |
Accrued Liabilities: |  |  |  |  |  |  |  |
Compensation and related expenses |  | $ | 4,563 |  |  | $ | 2,517 |
Property costs |  |  | 2,003 |  |  |  | 4,549 |
Other |  |  | 816 |  |  |  | 552 |
Total |  | $ | 7,382 |  |  | $ | 7,618 |

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