Consolidated Statements Of Operations - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues	$ 233,040,000	$ 225,280,000
Costs and Expenses
Lease operating	42,031,000	39,273,000
Production and ad valorem taxes	14,894,000	12,548,000
Depreciation, depletion and amortization	75,322,000	64,467,000
General and administrative, net	24,732,000	27,292,000
Loss on derivatives, net	83,284,000	29,596,000
Interest expense, net	16,451,000	15,517,000
Loss on extinguishment of debt	0	8,676,000
Other expense, net	4,358,000	100,000
Total Costs and Expenses	261,072,000	197,469,000
Income (Loss) Before Income Taxes	(28,032,000)	27,811,000
Income tax (expense) benefit	179,395,000	(319,000)
Net Income (loss)	151,363,000	27,492,000
Dividends on preferred stock	(4,360,000)	(4,863,000)
Accretion on preferred stock	(801,000)	(753,000)
Loss on redemption of preferred stock	0	(7,133,000)
Net Income Attributable to Common Shareholders	$ 146,202,000	$ 14,743,000
Net Income Attributable to Common Shareholders Per Common Share
Income (loss) per share, basic (in dollars per share)	$ 1.59	$ 0.18
Income (loss) per share, diluted (in dollars per share)	$ 1.58	$ 0.18
Weighted Average Common Shares Outstanding
Basic (in shares)	91,740	81,542
Diluted (in shares)	92,292	82,578
Oil and Condensate
Revenues	$ 202,744,000	$ 194,919,000
Natural Gas Liquids
Revenues	16,837,000	16,902,000
Natural Gas, Production
Revenues	$ 13,459,000	$ 13,459,000