RELATED PARTY TRANSACTIONS (Details) - Emerald [Member] $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Well	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Number of producing wells, gross | Well	49
Number of producing wells, net | Well	8.1
Amount incurred in working interest of its wells	$ 86.6
Accounts receivable from related parties	1.1	$ 2.9	$ 4.6
Accounts payable to related parties	0.3	8.4	23.2
Revenue from related party transactions	$ 15.3	$ 13.3	$ 7.8