CONCENTRATIONS - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Unusual Risk or Uncertainty [Line Items]
Maximum amount of credit risk exposure	$ 27,736
GOM Deep Water, Conventional Shelf and Deep Gas Properties
Unusual Risk or Uncertainty [Line Items]
Estimated proved reserves derived	66.00%
Production associated with properties	65.00%
Appalachian Properties
Unusual Risk or Uncertainty [Line Items]
Estimated proved reserves derived	34.00%
Production associated with properties	35.00%