Condensed Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
REVENUES
Oil and natural gas sales	$ 221,781	$ 230,760	$ 455,434	$ 418,149
Electricity sales	5,860	7,964	11,840	14,376
Natural gas marketing	1,580	3,985	3,439	7,670
(Loss) gain on sale of assets	(163)	0	1,600	0
Other Income	645	803	1,392	931
TOTAL REVENUES	229,703	243,512	473,705	441,126
EXPENSES
Operating costs—oil and natural gas production	62,461	58,780	116,713	115,863
Operating costs- electricity generation	4,256	6,891	9,273	13,004
Production taxes	9,690	8,350	20,348	15,741
Depreciation, depletion & amortization			100,903	105,068
Natural gas marketing	1,387	3,674	3,164	7,190
General and administrative	17,965	15,910	35,706	32,201
Interest	20,789	17,712	40,893	33,367
Impairment of oil and natural gas properties	38	0	66	0
Dry hole, abandonment, impairment and exploration	1,547	310	4,555	423
Gain on purchase	0	0	0	(1,046)
Extinguishment of debt	41,526	0	41,526	0
Realized and unrealized (gain) loss on derivatives, net	(113,082)	(91,808)	(84,601)	35,708
TOTAL EXPENSES	99,058	72,277	288,546	357,519
Earnings before income taxes	130,645	171,235	185,159	83,607
Income tax provision	49,629	66,069	70,245	30,938
Net earnings	81,016	105,166	114,914	52,669
Basic net earnings per share (in dollars per share)	$ 1.47	$ 1.93	$ 2.08	$ 0.97
Diluted net earnings per share (in dollars per share)	$ 1.46	$ 1.90	$ 2.07	$ 0.95
Dividends per share (in dollars per share)	$ 0.080	$ 0.075	$ 0.160	$ 0.150
Oil and Natural Gas Properties, Buildings, and Equipment
EXPENSES
Depreciation, depletion & amortization	52,026	51,967	99,982	104,076
Electricity Generation
EXPENSES
Depreciation, depletion & amortization	$ 455	$ 491	$ 921	$ 992