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Accrued Liabilities (Tables)
 12 Months Ended
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