COMMITMENTS AND CONTINGENCIES Long-term fIrm transportation costs (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Transportation, gathering and processing expenses		$ 18,415,000	$ 10,151,000	$ 4,592,000
Utica Shale natural gas and Wattenberg Field crude oil [Member]
Loss Contingencies [Line Items]
Transportation, gathering and processing expenses	$ 4,700,000	10,000,000		300,000
Utica Shale natural gas and Wattenberg Field crude oil [Member]
Loss Contingencies [Line Items]
Transportation, gathering and processing expenses		$ 3.4	$ 3.4	$ 3.4