CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
REVENUES
Gas sales	$ 79.2	$ 111.9	$ 164.3	$ 233.9
Oil sales	207.7	250.4	351.5	429.2
NGL sales	22.8	26.1	36.4	45.2
Other revenue	(0.5)	5.2	1.8	9.6
Purchased gas and oil sales	24.5	181.0	41.0	324.8
Total Revenues	333.7	574.6	595.0	1,042.7
OPERATING EXPENSES
Purchased gas and oil expense	26.8	183.2	43.7	329.1
Lease operating expense	52.6	57.1	112.6	118.9
Gas, oil and NGL transportation and other handling costs	69.5	73.0	143.1	138.1
Gathering and other expense	1.6	1.4	2.9	3.1
General and administrative	43.7	51.3	92.4	98.7
Production and property taxes	20.7	32.7	38.5	60.5
Depreciation, depletion and amortization	209.7	215.8	449.7	411.2
Exploration expenses	0.4	0.8	0.7	1.9
Impairment	0.8	0.5	1,183.2	20.5
Total operating expenses	425.8	615.8	2,066.8	1,182.0
Net gain (loss) from asset sales	(0.8)	24.5
OPERATING INCOME (LOSS)	(92.9)	(16.7)	(1,472.1)	(145.3)
Realized and unrealized gains (losses) on derivative contracts (See Note 7)	(180.5)	(66.0)	(129.6)	14.9
Interest and other income (expense)	(0.3)	3.8	2.0	1.2
Interest expense	(36.6)	(36.2)	(73.3)	(73.0)
INCOME (LOSS) BEFORE INCOME TAXES	(310.3)	(115.1)	(1,673.0)	(202.2)
Income tax (provision) benefit	113.3	38.8	612.2	70.3
NET INCOME (LOSS)	$ (197.0)	$ (76.3)	$ (1,060.8)	$ (131.9)
Earnings per common share
Earnings Per Share, Basic	$ (0.90)	$ (0.43)	$ (5.21)	$ (0.75)
Earnings Per Share, Diluted	$ (0.90)	$ (0.43)	$ (5.21)	$ (0.75)
Weighted-average common shares outstanding
Used in basic calculation (in shares)	217.7	176.7	203.7	176.4
Used in diluted calculation (in shares)	217.7	176.7	203.7	176.4
Dividends per common share (in dollars per share)	$ 0.00	$ 0.02	$ 0.00	$ 0.04