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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accrued liabilities    
Sales volume discounts payable $ 10,153 $ 13,940
Property taxes payable 755 2,937
Commissions payable 2,275 1,768
Accrued salaries 2,243 4,235
Other accrued liabilities 547 558
Total accrued liabilities $ 15,973 $ 23,438 [1]
[1] The consolidated balance sheet at December 31, 2012, as presented, is derived from the audited consolidated financial statements at that date.