CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
OPERATING REVENUES
Natural gas	$ 224,806	$ 437,761	$ 584,997	$ 870,571
Crude oil and condensate	81,233	86,341	143,791	145,485
Gain (loss) on derivative instruments	(6,819)	(2,329)	27,304	(2,329)
Brokered natural gas	3,813	8,140	8,640	21,293
Other	3,264	3,274	6,330	7,970
TOTAL OPERATING REVENUES	306,297	533,187	771,062	1,042,990
OPERATING EXPENSES
Direct operations	36,112	35,605	72,129	71,439
Transportation and gathering	98,295	83,976	219,531	161,741
Brokered natural gas	2,885	7,031	6,624	18,891
Taxes other than income	11,611	12,816	22,891	25,860
Exploration	5,298	4,676	14,030	11,150
Depreciation, depletion and amortization	152,513	157,563	328,009	304,981
General and administrative	19,978	20,127	42,507	41,763
TOTAL OPERATING EXPENSES	326,692	321,794	705,721	635,825
Earnings (loss) on equity method investments	1,512	756	2,933	756
Gain (loss) on sale of assets	(79)	(1,496)	59	(2,781)
INCOME (LOSS) FROM OPERATIONS	(18,962)	210,653	68,333	405,140
Interest expense	24,168	16,334	47,734	32,891
Income (loss) before income taxes	(43,130)	194,319	20,599	372,249
Income tax (benefit) expense	(15,622)	75,899	7,852	146,798
NET INCOME (LOSS)	$ (27,508)	$ 118,420	$ 12,747	$ 225,451
Earnings (loss) per share
Basic (in dollars per share)	$ (0.07)	$ 0.28	$ 0.03	$ 0.54
Diluted (in dollars per share)	$ (0.07)	$ 0.28	$ 0.03	$ 0.54
Weighted-average common shares outstanding
Basic (in shares)	413,713	417,291	413,530	417,097
Diluted (in shares)	413,713	419,092	414,878	418,742
Dividends per common share (in dollars per share)	$ 0.02	$ 0.02	$ 0.04	$ 0.04