CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share amounts) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating revenues and other income:
Oil, gas, and NGL production revenue	$ 284,939	$ 291,142	$ 618,137	$ 502,965
Net gain (loss) on divestiture activity	(167,133)	50,046	(129,670)	(18,975)
Other operating revenues	2,915	626	4,992	900
Total operating revenues and other income	120,721	341,814	493,459	484,890
Operating expenses:
Oil, gas, and NGL production expense	124,376	148,591	262,422	293,134
Depletion, depreciation, amortization, and asset retirement obligation liability accretion	153,232	211,020	291,044	425,227
Exploration	13,072	13,187	25,050	28,460
Impairment of proved properties	3,806	0	3,806	269,785
Abandonment and impairment of unproved properties	157	38	157	2,349
General and administrative	28,460	28,200	57,684	60,438
Net derivative (gain) loss	(55,189)	163,351	(169,963)	149,123
Other operating expenses	445	7,976	5,304	13,648
Total operating expenses	268,359	572,363	475,504	1,242,164
Income (loss) from operations	(147,638)	(230,549)	17,955	(757,274)
Non-operating income (expense):
Interest expense	(44,595)	(34,035)	(91,548)	(65,123)
Gain (loss) on extinguishment of debt	0	0	(35)	15,722
Other, net	1,265	5	1,600	11
Loss before income taxes	(190,968)	(264,579)	(72,028)	(806,664)
Income tax benefit	71,061	95,898	26,555	290,773
Net loss	$ (119,907)	$ (168,681)	$ (45,473)	$ (515,891)
Basic weighted-average common shares outstanding	111,277	68,102	111,274	68,090
Diluted weighted-average common shares outstanding	111,277	68,102	111,274	68,090
Basic net loss per common share	$ (1.08)	$ (2.48)	$ (0.41)	$ (7.58)
Diluted net loss per common share	(1.08)	(2.48)	(0.41)	(7.58)
Dividends per common share	$ 0.00	$ 0.00	$ 0.05	$ 0.05