Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical)

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CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
OPERATING COSTS AND EXPENSES    
Depreciation and amortization included in the cost of petrochemical product sales and processing $ 2,026us-gaap_CostOfGoodsSoldDepreciation $ 865us-gaap_CostOfGoodsSoldDepreciation