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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Other current liabilities    
Payroll and incentive compensation $ 10,695 $ 10,435
Union dues and benefits 6,210 6,617
Profit sharing and thrift plan 4,679 2,780
Taxes, other than income taxes 5,771 3,929
Other 4,885 5,317
Other current liabilities, total $ 32,240 $ 29,078