CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
OPERATING COSTS AND EXPENSES
Cost of petrochemical product Sales and Processing, depreciation	$ 3,053	[1]	$ 2,744	[2]	$ 2,271	[2]

[1] Restated - see Note 3

[2] Restated - see Note 2