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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING COSTS AND EXPENSES    
Cost of petrochemical product Sales and Processing, depreciation $ 825 $ 724 [1]
[1] (Restated)