SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Changes in Estimated Proved Reserves (Unaudited) (Details) Mcf in Thousands	12 Months Ended
	Dec. 31, 2016 Boe Rate Mcf bbl	Dec. 31, 2015 Boe Rate Mcf bbl	Dec. 31, 2014 Boe Rate Mcf bbl	Dec. 31, 2013 Mcf bbl
Crude Oil (Bbls)
Reserve Quantities [Line Items]
Proved Reserves	118,169,000	98,975,000	100,515,000	93,830,000
Production	(8,728,000)	(6,984,000)	(4,322,000)
Purchases of Reserves	50,126,000	17,000	5,000
Dispositions	(601,000)	(12,000)	(13,000)
Extensions, Discoveries, and Other Additions	494,000	48,707,000	40,792,000
Revisions of Previous Estimates	(22,097,000)	(43,268,000)	(29,777,000)
Proved Developed Reserves	30,013,000	26,257,000	26,798,000
Proved Undeveloped Reserve	88,156,000	72,718,000	73,717,000
Natural Gas (Mcf)
Reserve Quantities [Line Items]
Proved Reserves | Mcf	833,697	660,737	536,972	739,640
Production | Mcf	(51,730)	(33,302)	(19,298)
Purchases of Reserves | Mcf	305,224	215	43
Dispositions | Mcf	(4,202)	(82)	(237,306)
Extensions, Discoveries, and Other Additions | Mcf	4,094	311,709	202,957
Revisions of Previous Estimates | Mcf	(80,426)	(154,775)	(149,064)
Proved Developed Reserves | Mcf	264,452	175,367	186,633
Proved Undeveloped Reserve | Mcf	569,245	485,370	350,339
Natural Gas Liquids (Bbls)
Reserve Quantities [Line Items]
Proved Reserves	84,288,000	63,727,000	60,119,000	48,671,000
Production	(4,826,000)	(2,835,000)	(1,756,000)
Purchases of Reserves	32,586,000	23,000	5,000
Dispositions	(424,000)	(8,000)	(8,000)
Extensions, Discoveries, and Other Additions	355,000	30,835,000	23,411,000
Revisions of Previous Estimates	(7,130,000)	(24,407,000)	(10,204,000)
Proved Developed Reserves	24,196,000	15,011,000	17,002,000
Proved Undeveloped Reserve	60,092,000	48,716,000	43,117,000
Crude Oil Equivalent (Boe)
Reserve Quantities [Line Items]
Proved Reserves	341,407,000	272,825,000	250,129,000	265,774,000
Production	(22,176,000)	(15,369,000)	(9,294,000)
Purchases of Reserves	133,583,000	76,000	17,000
Dispositions	(1,725,000)	(34,000)	(39,572,000)
Extensions, Discoveries, and Other Additions	1,531,000	131,494,000	98,029,000
Revisions of Previous Estimates	(42,631,000)	(93,471,000)	(64,825,000)
Proved Developed Reserves	98,284,000	70,496,000	74,905,000
Proved Undeveloped Reserve	243,122,000	202,329,000	175,224,000
Year-over-Year Activity [Domain]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves percent increase or decrease | Rate	25.13773%
Increase (decrease) in proved reserves | Boe	68,582,000	23,000,000	(16,000,000)
Production	500,000
Proved developed and undeveloped reserves performance revisions	2,100,000
Undeveloped Reserves Converted to Developed	32,200,000.0	29,000,000	13,000,000
Estimated PUD conversion rate for following year | Rate	26.00%
Dispositions			(40,000,000)
Extensions, Discoveries, and Other Additions	16,800,000.0	131,000,000	98,000,000
Revisions of Previous Estimates		93,000,000	(65,000,000)
Estimated PUD conversion rate | Rate	19.00%	16.00%	7.00%
Actual PUD conversion rate | Rate	16.00%	17.00%	7.00%
2015 PUD Reserves [Member] | Year-over-Year Activity [Domain]
Reserve Quantities [Line Items]
Increase (decrease) in proved reserves | Boe	61,000,000.0