CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share amounts) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating revenues:
Oil, gas, and NGL production revenue	$ 333,198	$ 211,823
Net gain (loss) on divestiture activity	37,463	(69,021)
Other operating revenues	2,077	274
Total operating revenues and other income	372,738	143,076
Operating expenses:
Oil, gas, and NGL production expense	138,046	144,543
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	137,812	214,207
Exploration	11,978	15,273
Impairment of proved properties	0	269,785
Abandonment and impairment of unproved properties	0	2,311
General and administrative	29,224	32,238
Net derivative gain	(114,774)	(14,228)
Other operating expenses	4,859	5,672
Total operating expenses	207,145	669,801
Income (loss) from operations	165,593	(526,725)
Non-operating income (expense):
Interest expense	(46,953)	(31,088)
Gain (loss) on extinguishment of debt	(35)	15,722
Other, net	335	6
Income (loss) before income taxes	118,940	(542,085)
Income tax (expense) benefit	(44,506)	194,875
Net income (loss)	$ 74,434	$ (347,210)
Basic weighted-average common shares outstanding	111,258	68,077
Diluted weighted-average common shares outstanding	111,329	68,077
Basic net income (loss) per common share	$ 0.67	$ (5.10)
Diluted net income (loss) per common share	0.67	(5.10)
Dividends per common share	$ 0.05	$ 0.05