Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Supplemental Information on Oil and Gas Producing Activities (Unaudited)

Schedule of capitalized costs relating to oil and gas producing activities

	Year ended December 31,
	2013		2014
	(In thousands)
Proved properties	$	3,621,672	$	6,515,221
Unproved properties		1,513,136		2,060,936
		5,134,808		8,576,157
Accumulated depreciation and depletion		(383,921)		(802,665)
Net capitalized costs	$	4,750,887	$	7,773,492

Schedule of costs incurred in certain oil and gas activities

	Year ended December 31,
	2012		2013		2014
Acquisition costs:
Proved property	$	10,254	$	15,300	$	64,066
Unproved property		687,403		440,825		777,422
Development costs		678,276		780,583		1,536,193
Exploration costs		158,074		835,382		940,957
Total costs incurred	$	1,534,007	$	2,072,090	$	3,318,638

Schedule of results of operations (including discontinued operations) for oil and gas producing activities

	Year ended December 31,
	2012		2013		2014
Revenues	$	390,378	$	821,445	$	1,736,752
Operating expenses:
Production expenses		185,505		278,348		578,672
Exploration expenses		15,339		22,272		27,893
Depreciation and depletion		181,664		219,830		418,744
Impairment of unproved properties		13,032		10,928		15,198
Results of operations before income tax expense (benefit)		(5,162)		290,067		696,245
Income tax (expense) benefit		2,008		(110,805)		(263,126)
Results of operations	$	(3,154)	$	179,262	$	433,119

Schedule of proved developed and undeveloped reserves

	Natural gas (Bcf)	NGLs (MMBbl)		Oil and condensate (MMBbl)		Equivalents (Bcfe)
Proved reserves:
December 31, 2011	3,931	164		17		5,017
Revisions	198	4		—	(a)	222
Extensions, discoveries and other additions	1,242	115		3		1,951
Production	(87)	—	(a)	—	(a)	(87)
Sale of reserves in place	(1,590)	(80)		(17)		(2,174)
December 31, 2012	3,694	203		3		4,929
Revisions	152	(140)		—	(a)	(788)
Extensions, discoveries and other additions	3,084	76		7		3,682
Production	(177)	(2)		—	(a)	(191)
December 31, 2013	6,753	137		10		7,632
Revisions	(1,025)	(6)		—	(a)	(1,054)
Extensions, discoveries and other additions	5,095	206		19		6,444
Purchases	29	—		—		29
Production	(317)	(7)		(1)		(368)
December 31, 2014	10,535	330		28		12,683

Less than 1.0.

Schedule of proved developed and undeveloped reserves by fiscal year maturity

	Natural gas (Bcf)	NGLs (MMBbl)	Oil and condensate (MMBbl)	Equivalents (Bcfe)
Proved developed reserves:
December 31, 2012	828	36	1	1,047
December 31, 2013	1,818	33	2	2,022
December 31, 2014	3,285	80	6	3,803
Proved undeveloped reserves:
December 31, 2012	2,866	167	2	3,822
December 31, 2013	4,936	105	8	5,610
December 31, 2014	7,250	250	22	8,880

Schedule of standardized measure of discounted future net cash flows attributable to proved reserves

	Year ended December 31,
(in millions)	2012		2013		2014
Future cash inflows	$	12,151	$	30,113	$	63,632
Future production costs		(1,660)		(5,967)		(21,722)
Future development costs		(3,270)		(5,349)		(8,212)
Future net cash flows before income tax		7,221		18,797		33,698
Future income tax expense		(1,603)		(5,308)		(10,726)
Future net cash flows		5,618		13,489		22,972
10% annual discount for estimated timing of cash flows		(4,017)		(8,979)		(15,337)
Standardized measure of discounted future net cash flows	$	1,601	$	4,510	$	7,635

Schedule of weighted average prices used to estimate the Company's total equivalent reserves

December 31, 2012	$	2.78
December 31, 2013	$	3.95
December 31, 2014	$	5.02

Schedule of changes in standardized measure of discounted future net cash flow

	Year ended December 31,
	2012		2013		2014
Sales of oil and gas, net of productions costs	$	(147)	$	(543)	$	(1,158)
Net changes in prices and production costs		(1,631)		1,061		(184)
Development costs incurred during the period		296		384		564
Net changes in future development costs		(92)		(181)		(102)
Extensions, discoveries and other additions		813		3,441		5,759
Acquisitions		—		2		42
Divestitures		(1,277)		—		—
Revisions of previous quantity estimates		88		(270)		(828)
Accretion of discount		322		192		600
Net change in income taxes		653		(1,165)		(2,198)
Other changes		106		(12)		630
Net increase (decrease)		(869)		2,909		3,125
Beginning of year		2,470		1,601		4,510
End of year	$	1,601	$	4,510	$	7,635