Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues and other income	$ 343,365	$ 387,063	$ 648,817	$ 740,297
Expenses
Taxes other than income	25,517	27,234	49,302	54,553
General and administrative expenses	17,506	19,412	36,431	39,644
Interest, net of amounts capitalized of $8,238, $8,851, $18,772 and $17,303, respectively	20,416	16,208	37,814	33,447
Depletion, depreciation, and amortization	58,264	52,944	115,561	105,395
Commodity derivatives expense (income)	(24,760)	96,199	58,617	145,024
Gain on debt extinguishment	(100,346)	0	(100,346)	0
Other expenses	2,386	4,178	6,524	7,564
Total expenses	131,296	347,410	473,181	647,046
Income before income taxes	212,069	39,653	175,636	93,251
Income tax provision	65,377	9,431	54,618	23,451
Net income	$ 146,692	$ 30,222	$ 121,018	$ 69,800
Net income per common share
Basic	$ 0.32	$ 0.07	$ 0.27	$ 0.17
Diluted	$ 0.32	$ 0.07	$ 0.26	$ 0.15
Weighted average common shares outstanding
Basic	452,612	433,467	452,169	413,217
Diluted	467,427	457,165	461,460	454,466
Other income
Revenues and other income	$ 2,367	$ 4,437	$ 4,457	$ 9,041
Transportation and marketing
Operating expenses	11,236	10,062	22,009	20,555
Oil, natural gas, and related product sales
Revenues and other income	330,421	375,565	624,998	715,586
Operating expenses	117,932	120,384	243,355	238,740
CO2
Revenues and other income	7,986	6,715	16,556	14,267
Operating expenses	581	500	1,137	962
Purchased oil sales
Revenues and other income	2,591	346	2,806	1,403
Operating expenses	$ 2,564	$ 289	$ 2,777	$ 1,162