CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUES
Gas sales	$ 123.2	$ 129.4	$ 287.5	$ 363.3
Oil sales	201.6	211.7	553.1	640.9
NGL sales	19.8	16.5	56.2	61.7
Other revenue	2.5	2.8	4.3	12.4
Purchased gas and oil sales	35.3	147.2	76.3	472.0
Total Revenues	382.4	507.6	977.4	1,550.3
OPERATING EXPENSES
Purchased gas and oil expense	37.1	146.0	80.8	475.1
Lease operating expense	50.7	56.7	163.3	175.6
Gas, oil and NGL transportation and other handling costs	75.8	78.1	218.9	216.2
Gathering and other expense	0.9	1.3	3.8	4.4
General and administrative	67.0	42.0	159.4	140.7
Production and property taxes	26.8	30.2	65.3	90.7
Depreciation, depletion and amortization	217.8	238.1	667.5	649.3
Exploration expenses	0.2	0.8	0.9	2.7
Impairment	5.0	15.0	1,188.2	35.5
Total operating expenses	481.3	608.2	2,548.1	1,790.2
Net gain (loss) from asset sales	5.3	12.9	5.0	6.9
OPERATING INCOME (LOSS)	(93.6)	(87.7)	(1,565.7)	(233.0)
Realized and unrealized gains (losses) on derivative contracts (Note 7)	44.5	153.6	(85.1)	168.5
Interest and other income (expense)	5.1	0.3	7.1	1.5
Interest expense	(35.9)	(36.4)	(109.2)	(109.4)
INCOME (LOSS) BEFORE INCOME TAXES	(79.9)	29.8	(1,752.9)	(172.4)
Income tax (provision) benefit	29.0	(8.7)	641.2	61.6
NET INCOME (LOSS)	$ (50.9)	$ 21.1	$ (1,111.7)	$ (110.8)
Earnings per common share
Earnings Per Share, Basic	$ (0.21)	$ 0.12	$ (5.15)	$ (0.63)
Earnings Per Share, Diluted	$ (0.21)	$ 0.12	$ (5.15)	$ (0.63)
Weighted-average common shares outstanding
Used in basic calculation (in shares)	239.6	176.7	215.7	176.5
Used in diluted calculation (in shares)	239.6	176.7	215.7	176.5
Dividends per common share (in dollars per share)	$ 0.00	$ 0.02	$ 0.00	$ 0.06