CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
OPERATING REVENUES
Natural gas	$ 222,963	$ 347,970	$ 807,960	$ 1,218,540
Crude oil and condensate	59,014	82,563	202,804	228,047
Gain (loss) on derivative instruments	17,364	71,906	44,668	69,577
Brokered natural gas	4,010	6,501	12,650	27,794
Other	1,945	3,077	8,277	11,049
TOTAL OPERATING REVENUES	305,296	512,017	1,076,359	1,555,007
OPERATING EXPENSES
Direct operations	34,818	37,802	106,947	109,241
Transportation and gathering	102,121	85,966	321,652	247,707
Brokered natural gas	3,020	5,680	9,643	24,570
Taxes other than income	11,407	10,933	34,298	36,794
Exploration	4,930	8,812	18,960	19,963
Depreciation, depletion and amortization	144,326	154,013	472,335	458,995
General and administrative	11,102	19,579	53,611	61,342
TOTAL OPERATING EXPENSES	311,724	322,785	1,017,446	958,612
Earnings (loss) on equity method investments	1,648	1,063	4,581	1,819
Gain (loss) on sale of assets	3,756	46	3,814	(2,735)
INCOME (LOSS) FROM OPERATIONS	(1,024)	190,341	67,308	595,479
Interest expense	24,510	17,422	72,244	50,312
Income (loss) before income taxes	(25,534)	172,919	(4,936)	545,167
Income tax (benefit) expense	(10,020)	72,131	(2,169)	218,928
NET INCOME (LOSS)	$ (15,514)	$ 100,788	$ (2,767)	$ 326,239
Earnings (loss) per share
Basic (in dollars per share)	$ (0.04)	$ 0.24	$ (0.01)	$ 0.78
Diluted (in dollars per share)	$ (0.04)	$ 0.24	$ (0.01)	$ 0.78
Weighted-average common shares outstanding
Basic (in shares)	413,846	416,173	413,636	416,785
Diluted (in shares)	413,846	418,093	413,636	418,468
Dividends per common share (in dollars per share)	$ 0.02	$ 0.02	$ 0.06	$ 0.06