Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical)

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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
OPERATING COSTS AND EXPENSES      
Depreciation included in the cost of petrochemical product sales and processing $ 4,645us-gaap_CostOfGoodsSoldDepreciation $ 3,518us-gaap_CostOfGoodsSoldDepreciation $ 3,053us-gaap_CostOfGoodsSoldDepreciation