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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Accrued Liabilities [Abstract] |  |
Compensation and benefits | $ 86,400 | $ 130,455
Medical insurance and workers' compensation | 25,034 | 26,399
Franchise, property, sales and use taxes | 19,792 | 20,232
Legal contingencies | 18,700 | 1,000
Customer volume discounts and rebates | 9,295 | 11,436
Severance | 7,281 | 8,172
Environmental liabilities and asset retirement obligations | 5,938 | 7,812
Other | 8,429 | 8,552
Total | $ 180,869 | $ 214,058

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