Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total operating revenues	$ 155,406	$ 190,138	$ 426,867	$ 415,511
Expenses:
Lease operating expenses	15,889	23,645	33,114	45,409
Facility lease expense	6,543	6,526	13,188	12,682
Production taxes	16,443	18,883	46,618	42,153
Gathering fees	20,320	24,181	40,200	47,238
Depletion, depreciation and amortization	55,768	51,742	107,422	102,282
General and administrative	7,433	2,063	14,485	14,752
Other operating expenses, net	15,281	639	16,085	853
Total operating expenses	137,677	127,679	271,112	265,369
Operating income	17,729	62,459	155,755	150,142
Other income (expense), net:
Interest expense	(32,376)	(37,715)	(65,703)	(73,552)
Gain (loss) on commodity derivatives	71,654	(47,271)	7,316	(53,803)
Deferred gain on sale of liquids gathering system		2,638		5,276
Other income (expense), net	(43)	(657)	243	(688)
Total other (expense) income, net	39,235	(83,005)	(58,144)	(122,767)
Income before income tax (benefit) provision	56,964	(20,546)	97,611	27,375
Income tax (benefit) provision	(141)	9	(169)	442
Net income (loss)	$ 57,105	$ (20,555)	$ 97,780	$ 26,933
Basic earnings (loss) per share:
Net income (loss) per common share - basic	$ 0.29	$ (0.10)	$ 0.50	$ 0.14
Fully diluted earnings (loss) per share:
Net income (loss) per common share - fully diluted	$ 0.29	$ (0.10)	$ 0.49	$ 0.14
Weighted average common shares outstanding - basic	197,514	197,054	197,449	196,803
Weighted average common shares outstanding - fully diluted	198,069	197,054	198,089	196,803
Natural Gas Sales
Revenues:
Total operating revenues	$ 125,915	$ 141,255	$ 371,903	$ 322,716
Oil Sales
Revenues:
Total operating revenues	27,301	43,167	50,767	84,451
Other Revenues
Revenues:
Total operating revenues	$ 2,190	$ 5,716	$ 4,197	$ 8,344