CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share data) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating revenues and other income:
Oil, gas, and NGL production revenue	$ 382,886	$ 333,198
Net gain on divestiture activity	385,369	37,463
Other operating revenues	1,340	2,077
Total operating revenues and other income	769,595	372,738
Operating expenses:
Oil, gas, and NGL production expense	120,879	138,046
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	130,473	137,812
Exploration	13,727	11,817
Abandonment and impairment of oil and gas properties	5,625	0
General and administrative	27,682	28,817
Net derivative (gain) loss	7,529	(114,774)
Other operating expenses	4,612	4,859
Total operating expenses	310,527	206,577
Income from operations	459,068	166,161
Interest expense	(43,085)	(46,953)
Loss on extinguishment of debt	0	(35)
Other non-operating income (expense), net	409	(233)
Income before income taxes	416,392	118,940
Income tax expense	98,991	44,506
Net income	$ 317,401	$ 74,434
Basic weighted-average common shares outstanding	111,696	111,258
Diluted weighted-average common shares outstanding	112,879	111,329
Basic net income per common share	$ 2.84	$ 0.67
Diluted net income per common share	2.81	0.67
Dividends per common share	$ 0.05	$ 0.05