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EQUITY INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Equity investments
Earnings from equity investments	$ 1,953	$ 1,786	$ 3,582	$ 3,734
West Shore Pipe Line Company
Equity investments
Earnings from equity investments	1,323	1,419	2,573	3,104
Muskegon Pipeline LLC
Equity investments
Earnings from equity investments	390	156	631	419
Transport4, LLC
Equity investments
Earnings from equity investments	140	78	196	78
South Portland Terminal LLC
Equity investments
Earnings from equity investments	$ 100	$ 133	$ 182	$ 133

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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