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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2013
Components of Accrued Liabilities | The components of accrued liabilities are as follows (in thousands):
| December 31,
| 2013 |  | 2012
Compensation and benefits | $ | 130,455 |  |  | $ | 71,246 |
Medical insurance and workers’ compensation | 26,399 |  |  | 18,448 |
Customer volume discounts and rebates | 11,436 |  |  | 13,365 |
Franchise, property, sales and use taxes | 20,232 |  |  | 9,337 |
Asset retirement obligations | 4,002 |  |  | — |
Severance | 8,172 |  |  | — |
Other | 13,362 |  |  | 10,300 |
Total | $ | 214,058 |  |  | $ | 122,696 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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