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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accrued Liabilities [Abstract]    
Compensation and benefits $ 136,996 $ 130,455
Franchise, property, sales and use taxes 27,942 20,232
Medical insurance and workers’ compensation 26,185 26,399
Customer volume discounts and rebates 12,695 11,436
Environmental liabilities and asset retirement obligations 6,829 7,812
Severance 2,052 8,172
Legal contingencies 1,283 1,000
Other 14,776 8,552
Total $ 228,758 $ 214,058