CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
REVENUES
Gas sales	$ 85.1	$ 122.0
Oil sales	143.8	178.8
NGL sales	13.6	19.1
Other revenue	2.3	4.4
Purchased gas and oil sales	16.5	143.8
Total Revenues	261.3	468.1
OPERATING EXPENSES
Purchased gas and oil expense	16.9	145.9
Lease operating expense	60.0	61.8
Gas, oil and NGL transportation and other handling costs	73.6	65.1
Gathering and other expense	1.3	1.7
General and administrative	48.7	47.4
Production and property taxes	17.8	27.8
Depreciation, depletion and amortization	240.0	195.4
Exploration expenses	0.3	1.1
Impairment	1,182.4	20.0
Total operating expenses	1,641.0	566.2
Net gain (loss) from asset sales	0.5	(30.5)
OPERATING INCOME (LOSS)	(1,379.2)	(128.6)
Realized and unrealized gains (losses) on derivative contracts (See Note 7)	50.9	80.9
Interest and other income (expense)	2.3	(2.6)
Interest expense	(36.7)	(36.8)
INCOME (LOSS) BEFORE INCOME TAXES	(1,362.7)	(87.1)
Income tax (provision) benefit	498.9	31.5
NET INCOME (LOSS)	$ (863.8)	$ (55.6)
Earnings per common share
Earnings Per Share, Basic	$ (4.55)	$ (0.32)
Earnings Per Share, Diluted	$ (4.55)	$ (0.32)
Weighted-average common shares outstanding
Used in basic calculation (in shares)	189.7	176.2
Used in diluted calculation (in shares)	189.7	176.2
Dividends per common share (in dollars per share)	$ 0.00	$ 0.02