Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Crude oil revenues	$ 229,798	$ 142,806	$ 424,717	$ 270,898
Natural gas liquids revenues	21,269	7,786	38,171	15,211
Natural gas revenues	12,906	15,891	26,365	31,729
Total revenues	263,973	166,483	489,253	317,838
Costs and Expenses
Lease operating	35,151	36,048	74,424	65,893
Production taxes	12,487	7,143	23,062	13,351
Ad valorem taxes	3,640	1,073	5,613	4,040
Depreciation, depletion and amortization	72,430	59,072	136,897	113,454
General and administrative, net	18,265	11,596	45,557	33,299
(Gain) loss on derivatives, net	67,714	(26,065)	97,310	(51,381)
Interest expense, net	15,599	21,106	31,116	41,677
Loss on extinguishment of debt	0	0	8,676	0
Other expense, net	2,895	204	2,995	1,178
Total Costs and Expenses	228,181	110,177	425,650	221,511
Income Before Income Taxes	35,792	56,306	63,603	96,327
Income tax expense	(483)	0	(802)	0
Net Income (loss)	35,309	56,306	62,801	96,327
Dividends on preferred stock	(4,474)	0	(9,337)	0
Accretion on preferred stock	(740)	0	(1,493)	0
Loss on redemption of preferred stock	0	0	(7,133)	0
Net Income Attributable to Common Shareholders	$ 30,095	$ 56,306	$ 44,838	$ 96,327
Net Income Attributable to Common Shareholders Per Common Share
Income (loss) per share, basic (in dollars per share)	$ 0.37	$ 0.86	$ 0.55	$ 1.47
Income (loss) per share, diluted (in dollars per share)	$ 0.36	$ 0.85	$ 0.54	$ 1.46
Weighted Average Common Shares Outstanding
Basic (in shares)	82,058	65,767	81,802	65,479
Diluted (in shares)	83,853	65,908	83,240	65,866