CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Operating Revenues:
Gas sales	$ 2,381,478		$ 1,956,311		$ 2,078,151
Gas marketing	792,165		591,528		714,123
Oil sales	16,420		8,427		9,085
Gas gathering	181,082		173,727		149,973
Total Operating Revenues	3,371,145		2,729,993		2,951,332
Operating Costs and Expenses:
Gas purchases - midstream services	781,626		592,466		709,091
Operating expenses	328,503		244,735		240,944
General and administrative expenses	191,310		175,147		158,041
Depreciation, depletion and amortization	786,612		810,953		704,511
Impairment of natural gas and oil properties			1,939,734
Taxes, other than income taxes	79,471		67,584		65,518
Total operating costs and expenses	2,167,522		3,830,619		1,878,105
Operating Income (Loss)	1,203,623		(1,100,626)	[1]	1,073,227
Interest Expense:
Interest on debt	100,051		93,296		65,421
Other interest charges	4,355		4,454		4,306
Interest capitalized	(62,812)		(62,093)		(45,652)
Total Interest Expense	41,594	[2]	35,657	[2]	24,075	[2]
Other Income, Net	2,207		1,030		264
Gain (Loss) on Derivatives	26,141		(14,950)		1,574
Income (Loss) Before Income Taxes	1,190,377		(1,150,203)		1,050,990
Provision (Benefit) for Income Taxes:
Current	(11,071)		18,689		4,198
Deferred	497,945		(461,828)		409,023
Total provision for income taxes	486,874	[2]	(443,139)	[2]	413,221	[2]
Net Income (Loss)	$ 703,503		$ (707,064)		$ 637,769
Earnings (Loss) Per Share:
Basic	$ 2.01		$ (2.03)		$ 1.84
Diluted	$ 2.00		$ (2.03)		$ 1.82
Weighted Average Common Shares Outstanding:
Basic	350,465,430		348,610,503		347,205,316
Effect Of:
Stock Options	377,626				2,475,053
Restricted Stock Awards	258,396				241,044
Diluted	351,101,452		348,610,503		349,921,413

[1] The operating loss for the E&P segment for the twelve months ended December 31, 2012 includes a $1,939.7 million non-cash ceiling test impairment of our natural gas and oil properties.

[2] Interest expense and the provision (benefit) for income taxes by segment are an allocation of corporate amounts as they are incurred at the corporate level.