Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues
Oil, natural gas liquids and natural gas sales	$ 187,822us-gaap_OilAndGasRevenue	$ 350,822us-gaap_OilAndGasRevenue
Gain (loss) on derivative instruments, net	34,036	(53,391)
Total revenues	221,858us-gaap_SalesRevenueNet	297,431us-gaap_SalesRevenueNet
Operating Costs and Expenses
Oil, natural gas liquids and natural gas production	67,754	67,444
Production and ad valorem taxes	19,065	27,324
Depreciation, depletion and amortization	134,381	124,220
Asset impairment	6,583us-gaap_AssetImpairmentCharges	1,246us-gaap_AssetImpairmentCharges
Exploration	763us-gaap_ExplorationExpense	11,568us-gaap_ExplorationExpense
General and administrative	32,055us-gaap_GeneralAndAdministrativeExpense	32,173us-gaap_GeneralAndAdministrativeExpense
Accretion of discount on asset retirement obligations	2,010	1,843
(Gain) loss on sale of assets and other	(28,344)us-gaap_OtherOperatingIncomeExpenseNet	153us-gaap_OtherOperatingIncomeExpenseNet
Total costs and expenses	234,267us-gaap_CostsAndExpenses	265,971us-gaap_CostsAndExpenses
Operating Income (Loss)	(12,409)us-gaap_OperatingIncomeLoss	31,460us-gaap_OperatingIncomeLoss
Other Income (Expense)
Interest expense	(11,758)us-gaap_InterestExpense	(7,888)us-gaap_InterestExpense
Other income	46us-gaap_OtherNonoperatingIncome	323us-gaap_OtherNonoperatingIncome
Total other expense	(11,712)us-gaap_NonoperatingIncomeExpense	(7,565)us-gaap_NonoperatingIncomeExpense
Income (Loss) From Continuing Operations Before Income Taxes	(24,121)	23,895
Income tax expense (benefit)	(8,701)us-gaap_IncomeTaxExpenseBenefit	8,248us-gaap_IncomeTaxExpenseBenefit
Income (Loss) From Continuing Operations	(15,420)	15,647
Discontinued Operations, net of tax
Income from discontinued operations	0	38,719
Loss on disposal of discontinued operations	0	(1,050)
Income From Discontinued Operations	0	37,669
Net Income (Loss)	$ (15,420)us-gaap_NetIncomeLoss	$ 53,316us-gaap_NetIncomeLoss
Diluted Earnings Per Average Common Share
Continuing operations (in dollars per share)	$ (0.21)	$ 0.21
Discontinued operations (in dollars per share)	$ 0.00	$ 0.52
Net Income (Loss) (in dollars per share)	$ (0.21)us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted
Basic Earnings Per Average Common Share
Continuing Operations (in dollars per share)	$ (0.21)	$ 0.21
Discontinued operations (in dollars per share)	$ 0.00	$ 0.52
Net Income (Loss) (in dollars per share)	$ (0.21)us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic
Dividends Per Common (In dollar per shares)	$ 0.02	$ 0.15
Diluted Shares Outstanding (in shares)	72,830	73,045
Basic Shares Outstanding (in shares)	72,830	72,629

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