v3.3.1.900

ACCRUED LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2015
Accrued Liabilities, Current [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] | Accrued liabilities consisted of the following:
| December 31,
| 2015 |  | 2014
| (Thousands of Dollars)
Derivative liabilities | $ | 121 |  |  | $ | 4,623 |
Employee wages and benefit costs | 31,143 |  |  | 32,349 |
Unearned income | 14,290 |  |  | 10,884 |
Other | 9,640 |  |  | 13,169 |
Accrued liabilities | $ | 55,194 |  |  | $ | 61,025 |

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