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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