Consolidated Statements Of Operations - 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	$ 264,967	$ 263,973	$ 498,007	$ 489,253
Costs and Expenses
Lease operating	44,514	35,151	86,545	74,424
Production and ad valorem taxes	17,793	16,127	32,687	28,675
Depreciation, depletion and amortization	80,766	72,430	156,088	136,897
General and administrative, net	17,301	18,265	42,033	45,557
(Gain) loss on derivatives, net	(20,449)	67,714	62,835	97,310
Interest expense, net	18,024	15,599	34,475	31,116
Loss on extinguishment of debt	0	0	0	8,676
Other (income) expense, net	(2,766)	2,895	1,592	2,995
Total Costs and Expenses	155,183	228,181	416,255	425,650
Income Before Income Taxes	109,784	35,792	81,752	63,603
Income tax (expense) benefit	(2,299)	(483)	177,096	(802)
Net Income (loss)	107,485	35,309	258,848	62,801
Dividends on preferred stock	(4,452)	(4,474)	(8,812)	(9,337)
Accretion on preferred stock	(833)	(740)	(1,634)	(1,493)
Loss on redemption of preferred stock	0	0	0	(7,133)
Net Income Attributable to Common Shareholders	$ 102,200	$ 30,095	$ 248,402	$ 44,838
Net Income Attributable to Common Shareholders Per Common Share
Income (loss) per share, basic (in dollars per share)	$ 1.10	$ 0.37	$ 2.70	$ 0.55
Income (loss) per share, diluted (in dollars per share)	$ 1.10	$ 0.36	$ 2.69	$ 0.54
Weighted Average Common Shares Outstanding
Basic (in shares)	92,497	82,058	92,121	81,802
Diluted (in shares)	92,700	83,853	92,479	83,240
Oil and Condensate
Revenues	$ 245,212	$ 229,798	$ 447,956	$ 424,717
Natural Gas Liquids
Revenues	14,159	21,269	30,996	38,171
Natural Gas, Production
Revenues	$ 5,596	$ 12,906	$ 19,055	$ 26,365