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INVESTMENT IN STANDARD STEAM TRUST, LLC (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Noncontrolling Interest [Line Items]
Equity gain (loss) in unconsolidated investment	$ 0	$ (104,000)	$ (359,000)
Impairment of equity investment	0	2,160,000	0
Standard Steam Trust LLC [Member]
Noncontrolling Interest [Line Items]
Ownership percentage (in hundredths)		19.54%
Equity gain (loss) in unconsolidated investment		(104,000)
Impairment of equity investment		$ 2,200,000

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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