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Accrued Liabilities Components of Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Accrued Liabilities [Line Items]    
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 0
Severance 8,172 0
Other 13,362 10,300
Total $ 214,058 $ 122,696