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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2015
Payables and Accruals [Abstract] |
Summary of accrued liabilities | Accrued liabilities consisted of the following (in thousands):
| December 31,
| 2015 |  | 2014
Accrued salaries and other benefits | $ | 27,066 |  |  | $ | 39,182 |
Accrued income and other taxes | 15,006 |  |  | 20,807 |
Accrued interest | 12,675 |  |  | 14,286 |
Interest rate swaps fair value | 4,608 |  |  | 4,958 |
Accrued other liabilities | 20,698 |  |  | 11,949 |
Accrued liabilities | $ | 80,053 |  |  | $ | 91,182 |

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