SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Schedule of Developed and Undeveloped Reserves (Unaudited) (Details)	12 Months Ended
	Dec. 31, 2017 Rate bbl	Dec. 31, 2016 Rate bbl	Dec. 31, 2015 Rate bbl	Dec. 31, 2014 bbl
Schedule of Developed and Undeveloped Reserves [Line Items]
Proved Developed and Undeveloped Reserves, Net	452,917,000	341,407,000	272,825,000	250,129,000
Undeveloped Reserves Converted to Developed	0	0	0
Revisions of Previous Estimates	52,457,000	(42,631,000)	(93,471,000)
Extensions, Discoveries, and Other Additions	6,005,000	1,531,000	131,494,000
Purchases of Reserves	86,778,000	133,583,000	76,000
Dispositions	(1,900,000)	(1,725,000)	(34,000)
Negative revisions due to PUD locations dropped from 5 year development plan	57,700,000.0
Production	(31,830,000)	(22,176,000)	(15,369,000)
Estimated PUD conversion rate	16.00%
Increase or Decrease in Proved Reserves	111,500,000	0	22,700,000
Proved Undeveloped Reserves [Member]
Schedule of Developed and Undeveloped Reserves [Line Items]
Proved Developed and Undeveloped Reserves, Net	309,946,000	243,122,000	202,329,000	175,224,000
Undeveloped Reserves Converted to Developed	(54,648,000)	(32,192,000)	(29,090,000)
Revisions of Previous Estimates	34,166,000	(48,743,000)	(66,596,000)
Extensions, Discoveries, and Other Additions	3,713,000	0	122,791,000
Purchases of Reserves	85,473,000	123,354,000	0
Dispositions	(1,880,000)	(1,626,000)	0
Production	0	0	0
Proved Developed Reserves [Member]
Schedule of Developed and Undeveloped Reserves [Line Items]
Proved Developed and Undeveloped Reserves, Net	142,971,000	98,285,000	70,496,000	74,905,000
Undeveloped Reserves Converted to Developed	54,648,000	32,192,000	29,090,000
Revisions of Previous Estimates	18,291,000	6,112,000	(26,875,000)
Extensions, Discoveries, and Other Additions	2,292,000	1,531,000	8,703,000
Purchases of Reserves	1,305,000	10,229,000	76,000
Dispositions	(20,000)	(99,000)	(34,000)
Production	(31,830,000)	(22,176,000)	(15,369,000)
Crude Oil Equivalent (Boe)
Schedule of Developed and Undeveloped Reserves [Line Items]
Proved Developed and Undeveloped Reserves, Net	452,917,000	341,407,000	272,825,000	250,129,000
Revisions of Previous Estimates	52,457,000	(42,631,000)	(93,471,000)
Extensions, Discoveries, and Other Additions	6,005,000	1,531,000	131,494,000
Purchases of Reserves	86,778,000	133,583,000	76,000
Dispositions	(1,900,000)	(1,725,000)	(34,000)
Production	(31,830,000)	(22,176,000)	(15,369,000)
Crude Oil [Member]
Schedule of Developed and Undeveloped Reserves [Line Items]
Proved Developed and Undeveloped Reserves, Net	154,842,000	118,169,000	98,975,000	100,515,000
Revisions of Previous Estimates	28,334,000	(22,097,000)	(43,268,000)
Extensions, Discoveries, and Other Additions	2,923,000	494,000	48,707,000
Purchases of Reserves	18,971,000	50,126,000	17,000
Dispositions	(653,000)	(601,000)	(12,000)
Production	(12,902,000)	(8,728,000)	(6,984,000)
Year-over-Year Activity [Domain]
Schedule of Developed and Undeveloped Reserves [Line Items]
Undeveloped Reserves Converted to Developed		32,200,000.0	29,090,000
Revisions of Previous Estimates			93,471,000
Extensions, Discoveries, and Other Additions	93,900,000.0		131,494,000
Wells Per Section			16
Gross PUD horizontal locations			791	774
Proved developed and undeveloped reserves percent increase or decrease | Rate	32.6619%	2500.00%
Estimated PUD conversion rate | Rate		19.00%	16.00%
Actual PUD conversion rate | Rate	23.00%		17.00%
Change in drilling plans			(56,000,000)
Upward (Downward) Revision due to change in SEC pricing			(33,000,000)
Upward (Downward) Revision due to removal of re-fracs			(11,000,000)
Upward (downward) revision due to geological findings			(22,000,000)