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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Other current liabilities    
Payroll and incentive compensation $ 10,647 $ 10,695
Union dues and benefits 7,122 6,210
Profit sharing and thrift plan 2,862 4,679
Taxes, other than income taxes 4,286 5,771
Legal settlements 2,869  
Other 4,925 4,885
Other current liabilities, total $ 32,711 $ 32,240