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EQUITY INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity investments
Total earnings from equity investments	$ 2,134	$ 1,266
Muskegon Pipeline LLC
Equity investments
Total earnings from equity investments	87	249
Transport4, LLC
Equity investments
Total earnings from equity investments	(32)	67
West Shore Pipe Line Company
Equity investments
Total earnings from equity investments	1,778	660
South Portland Terminal LLC
Equity investments
Total earnings from equity investments	$ 301	$ 290

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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