CONCENTRATION OF RISK Customer Constituting 10% or more of Total Revenue (Details)	12 Months Ended
	Dec. 31, 2015 Rate	Dec. 31, 2014 Rate	Dec. 31, 2013 Rate
Suncor Energy Marketing, Inc.
Concentration Risk [Line Items]
Percentage of Revenue	14.30%	19.70%	35.90%
Percentage of Accounts Receivable Balance at Year-End		11.10%
Concord Energy
Concentration Risk [Line Items]
Percentage of Revenue	23.20%	18.30%	0.00%
Percentage of Accounts Receivable Balance at Year-End	11.30%	10.30%
Shell Trading Company
Concentration Risk [Line Items]
Percentage of Revenue	13.80%	0.00%	0.00%
DCP Midstream, LP
Concentration Risk [Line Items]
Percentage of Revenue	13.20%	15.10%	13.90%
Teppco Crude Oil
Concentration Risk [Line Items]
Percentage of Revenue	0.00%	12.90%	8.00%