SUPPLEMENTAL INFORMATION ON OIL AND NATURAL GAS OPERATIONS - UNAUDITED (Tables)

12 Months Ended

Dec. 31, 2014

Net Costs Incurred on Unevaluated Properties

The following table discloses net costs incurred (evaluated) on our unevaluated properties located in the United States for the years indicated:

	Year Ended December 31,
Unevaluated oil and gas properties – United States:	2014		2013		2012
Net costs incurred (evaluated) during year:
Acquisition costs		($42,384)		$30,271		$9,739
Exploration costs		(186,308)		188,830		(1,209)
Capitalized interest		45,722		46,860		37,656
		($182,970)		$265,961		$46,186

Financial Data Associated with Unevaluated Costs

The following table discloses financial data associated with unevaluated costs (United States and Canada) at December 31, 2014:

	Balance as of December 31, 2014		Net Costs Incurred During the Year Ended December 31,
			2014		2013		2012		2011 and prior
Acquisition costs		$285,896		$7,330		$82,990		$24,736		$170,840
Exploration costs		167,510		66,512		78,684		5,318		16,996
Capitalized interest		113,959		22,352		36,137		21,993		33,477
Total unevaluated costs		$567,365		$96,194		$197,811		$52,047		$221,313

Summary of Estimated Proved Oil and Natural Gas Reserve

 Estimated proved oil, natural gas and NGL reserves at December 31, 2014, 2013 and 2012 are prepared in accordance with the SEC’s rule, “Modernization of Oil and Gas Reporting,” using a historical 12-month average pricing assumption.

	Oil (MBbls)		NGLs (MBbls)		Natural Gas (MMcf)		Oil, Natural Gas and NGLs (MMcfe)
Estimated proved reserves as of December 31, 2011		45,655		4,405		325,479		625,839
Revisions of previous estimates		(1,559)		9,349		(26,694)		20,050
Extensions, discoveries and other additions		3,681		4,856		131,408		182,633
Purchase of producing properties		4,336		619		8,168		37,895
Sale of reserves		(60)		-		(418)		(775)
Production		(7,135)		(1,163)		(42,569)		(92,357)
Estimated proved reserves as of December 31, 2012		44,918		18,066		395,374		773,285
Revisions of previous estimates		3,606		2,439		36,006		72,275
Extensions, discoveries and other additions		2,367		4,395		79,729		120,299
Sale of reserves		(170)		-		(214)		(1,235)
Production		(6,894)		(1,603)		(50,129)		(101,111)
Estimated proved reserves as of December 31, 2013		43,827		23,297		460,766		863,513
Revisions of previous estimates		(624)		(331)		(4,631)		(10,362)
Extensions, discoveries and other additions		9,650		7,521		131,617		234,639
Sale of reserves		(4,888)		(556)		(46,483)		(79,151)
Production		(5,568)		(2,114)		(47,426)		(93,515)
Estimated proved reserves as of December 31, 2014		42,397		27,817		493,843		915,124
Estimated proved developed reserves:
as of December 31, 2012		29,005		8,593		210,956		436,540
as of December 31, 2013		27,920		11,569		246,946		483,885
as of December 31, 2014		22,957		13,743		249,924		470,118
Estimated proved undeveloped reserves:
as of December 31, 2012		15,913		9,473		184,418		336,745
as of December 31, 2013		15,907		11,728		213,820		379,628
as of December 31, 2014		19,440		14,074		243,919		445,006

Summary of Standardized Measure of Discounted Future Net Cash Flows

Standardized Measure Year Ended December 31,
	2014		2013		2012
Future cash inflows		$  6,635,751		$  7,040,928		$  6,295,455
Future production costs		(2,413,004)		(2,062,657)		(1,946,426)
Future development costs		(1,511,687)		(1,431,101)		(1,241,531)
Future income taxes		(609,516)		(884,637)		(799,007)
Future net cash flows		2,101,544		2,662,533		2,308,491
10% annual discount		(682,752)		(977,531)		(794,632)
Standardized measure of discounted future net cash flows		$  1,418,792		$  1,685,002		$  1,513,859

	Changes in Standardized Measure Year Ended December 31,
	2014		2013		2012
Standardized measure at beginning of year		$1,685,002		$1,513,859		$1,542,962
Sales and transfers of oil, gas and NGLs produced, net of production costs		(486,232)		(708,017)		(697,741)
Changes in price, net of future production costs		(864,118)		229,425		(380,841)
Extensions and discoveries, net of future production and development costs		549,649		155,592		178,272
Changes in estimated future development costs, net of development costs incurred during the period		203,026		28,684		212,329
Revisions of quantity estimates		(27,495)		281,558		76,450
Accretion of discount		222,009		202,087		207,292
Net change in income taxes		209,323		(28,084)		22,947
Purchases of reserves in-place		-		-		276,389
Sales of reserves in-place		(152,787)		15,531		2,480
Changes in production rates due to timing and other		80,415		(5,633)		73,320
Net increase (decrease) in standardized measure		(266,210)		171,143		(29,103)
Standardized measure at end of year		$1,418,792		$1,685,002		$1,513,859

United States [Member]

Financial Data Relative to Oil and Gas Producing Activities

The following table discloses certain financial data relative to our oil and gas producing activities located onshore and offshore in the continental United States:

	Year Ended December 31,
	2014		2013		2012
Oil and gas properties – United States, proved and unevaluated:
Balance, beginning of year		$8,517,873		$7,692,261		$7,049,777
Costs incurred during the year (capitalized):
Acquisition costs, net of sales of unevaluated properties		44,634		70,903		102,807
Exploratory costs		270,850		297,113		81,458
Development costs (1)		438,334		378,242		395,555
Salaries, general and administrative costs		33,975		32,815		25,318
Interest		45,722		46,860		37,656
Less: overhead reimbursements		(3,334)		(321)		(310)
Total costs incurred during the year, net of divestitures		830,181		825,612		642,484
Balance, end of year		$9,348,054		$8,517,873		$7,692,261
Accumulated DD&A:
Balance, beginning of year		($5,908,760)		($5,510,166)		($5,174,729)
Provision for DD&A		(335,987)		(346,827)		(341,096)
Write-down of oil and gas properties		(351,192)		-		-
Sale of proved properties		(374,692)		(51,767)		5,659
Balance, end of year		($6,970,631)		($5,908,760)		($5,510,166)
Net capitalized costs – United States, proved and unevaluated		$2,377,423		$2,609,113		$2,182,095
DD&A per Mcfe		$3.59		$3.43		$3.69
(1) Includes capitalized asset retirement costs of ($20,305), $54,737 and $95,293, respectively.
Costs incurred during the year (expensed):
Lease operating expenses		$176,495		$201,153		$215,003
Transportation, processing and gathering expenses		64,951		42,172		21,782
Production taxes		12,151		15,029		10,015
Accretion expense		28,411		33,575		33,331
Expensed costs – United States		$282,008		$291,929		$280,131

Canada [Member]

Financial Data Relative to Oil and Gas Producing Activities

The following table discloses certain financial data relative to our oil and gas activities located in Canada:

	Year Ended December 31,
	2014		2013
Oil and gas properties – Canada, unevaluated:
Balance, beginning of year		$10,583		$  -
Costs incurred during the year (capitalized):
Acquisition costs		6,956		8,764
Exploratory costs		19,040		1,819
Total costs incurred during the year		25,996		10,583
Balance, end of year, unevaluated		$36,579		$10,583