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Accrued Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2017
Payables and Accruals [Abstract] |
Schedule of accrued liabilities | Accrued liabilities consisted of the following (in thousands of dollars):
| September 30, 2017 |  | December 31, 2016
Accrued compensation expenses | $ | 4,966 |  |  | $ | 6,120 |
Accrued other | 3,092 |  |  | 2,990 |
Total accrued liabilities | $ | 8,058 |  |  | $ | 9,110 |

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