SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies - Top Customers (Details)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Entity-Wide Revenue, Major Customer, Percentage		100.00%	100.00%	100.00%
Phillips 66 Company [Member]
Entity-Wide Revenue, Major Customer, Percentage	[1]	0.00%	0.00%	10.00%
BG LNG Services
Entity-Wide Revenue, Major Customer, Percentage	[2]	0.00%	0.00%	22.00%
Ameren Corporation [Member]
Entity-Wide Revenue, Major Customer, Percentage		11.00%	11.00%	6.00%
Exelon Generation Company [Member] [Member]
Entity-Wide Revenue, Major Customer, Percentage		10.00%	0.00%	0.00%
Other Top 10 Customers
Entity-Wide Revenue, Major Customer, Percentage		28.00%	40.00%	20.00%
Remaining Customers
Entity-Wide Revenue, Major Customer, Percentage		51.00%	49.00%	42.00%

[1] SUGS, which was deconsolidated on April 30, 2013, had contracted to sell its entire owned or controlled output of NGL equity volumes to Customer A. Pricing for the NGL equity volumes sold to Customer A throughout the contract period was OPIS pricing based at Mont Belvieu, Texas delivery points.

[2] is the sole customer of Lake Charles LNG, which was deconsolidated effective January 1, 2014.