CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share data) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Operating revenues and other income:
Oil, gas, and NGL production revenue	[1]	$ 340,476	$ 382,886
Net gain on divestiture activity		61	385,369
Other operating revenues		393	1,340
Total operating revenues and other income		340,930	769,595
Operating expenses:
Oil, gas, and NGL production expense		121,305	120,879
Depletion, depreciation, amortization, and asset retirement obligation liability accretion		177,746	130,473
Exploration		11,348	13,727
Abandonment and impairment of unproved properties		6,338	5,625
General and administrative		32,086	27,682
Net derivative loss		177,081	7,529
Other operating expenses, net		335	4,612
Total operating expenses		526,239	310,527
Income (loss) from operations		(185,309)	459,068
Interest expense		(37,980)	(43,085)
Other non-operating income (expense), net		(317)	409
Income (loss) before income taxes		(223,606)	416,392
Income tax (expense) benefit		46,038	(98,991)
Net income (loss)		$ (177,568)	$ 317,401
Basic weighted-average common shares outstanding		112,252	111,696
Diluted weighted-average common shares outstanding		112,252	112,879
Basic net income (loss) per common share		$ (1.58)	$ 2.84
Diluted net income (loss) per common share		(1.58)	2.81
Dividends per common share		$ 0.05	$ 0.05

[1] Note: Amounts may not calculate due to rounding.