ACQUISITIONS (Details) $ / shares in Units, $ in Thousands, shares in Millions		12 Months Ended
	Aug. 11, 2014 USD ($) item shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($)
ACQUISITIONS
Common Stock issued for Citrus Acquisition			$ 41,400
Purchase price
Shares issued from acquisition			41,400
Fair values of the assets acquired and liabilities assumed
Asset Retirement Obligations		$ (31,405)	(29,771)	$ (26,785)
Citrus Acquisition Of Marcellus Assets
ACQUISITIONS
Number of other working interest owners | item	2
Common Stock issued for Citrus Acquisition			41,400
Purchase price
Cash consideration	$ 312,500		312,500
Shares issued from acquisition			41,400
Closing adjustments			(7,828)
Fair value of earn-out provision		730	6,340
Fair value of farm-out provision		$ (3,410)	3,410
Total purchase price			355,822
Maximum contingent consideration payout included as part of the purchase and sale agreement			$ 8,500
Probability percentage of achieving full contingent consideration payout			90.00%
Fair values of the assets acquired and liabilities assumed
Proved oil and gas properties			$ 171,383
Unproved oil and gas properties			184,752
Asset Retirement Obligations			(313)
Total purchase price			355,822
Unaudited Pro Forma Condensed Combined Financial Information
Revenues			212,518
Income from Operations			57,800
Net income			$ 52,395
Diluted net income per share | $ / shares			$ 0.65
Citrus Acquisition Of Marcellus Assets | Common stock
ACQUISITIONS
Number of shares exchanged | shares	6.7		6.7
Common Stock issued for Citrus Acquisition	$ 41,400		$ 41,400
Purchase price
Shares issued from acquisition	$ 41,400		$ 41,400