v2.4.0.6
ACCRUED LIABILITIES Table (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accrued liabilities [Line Items]    
Employee wages and benefit costs $ 24,325 $ 21,216
Derivative liabilities 27,433 14,741
Unearned income 8,866 4,375
Environmental costs 3,312 2,659
Product imbalances 1,469 988
Other 5,865 13,974
Accrued liabilities $ 71,270 $ 57,953