Disclosures About Oil and Gas Producing Activities (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Oil And Gas Exploration And Production Industries Disclosures [Abstract]

Analyses of changes in proven reserves

	United States
	Oil	Natural Gas
	(MBbls)	(MMcf)
Reserves, December 31, 2010	31,684	4,200,155
Extensions, discoveries and additions	7,425	1,452,122
Production	(1,408)	(236,832)
Revisions	(4,620)	(636,891)
Reserves, December 31, 2011	33,081	4,778,554
Extensions, discoveries and additions	5,435	819,896
Production	(1,282)	(249,310)
Revisions	(19,097)	(2,382,695)
Reserves, December 31, 2012	18,137	2,966,445
Extensions, discoveries and additions	11,329	1,409,528
Acquistions	10,114	-
Production	(1,196)	(224,912)
Revisions	(4,265)	(741,319)
Reserves, December 31, 2013	34,119	3,409,742
	United States
	Oil	Natural Gas
	(MBbls)	(MMcf)
Proved:
Developed	11,013	1,678,697
Undeveloped	20,671	2,521,458
Total Proved - 2010	31,684	4,200,155
Developed	11,794	1,973,391
Undeveloped	21,287	2,805,163
Total Proved - 2011	33,081	4,778,554
Developed	10,531	1,820,994
Undeveloped	7,606	1,145,451
Total Proved - 2012	18,137	2,966,445
Developed	20,566	1,777,267
Undeveloped	13,553	1,632,475
Total Proved - 2013	34,119	3,409,742

Standardized measure

		As of December 31,
		2013		2012		2011
Future cash inflows	$	14,861,131	$	9,380,970	$	22,196,913
Future production costs		(4,540,209)		(3,217,771)		(6,113,282)
Future development costs		(2,014,751)		(1,661,394)		(4,294,375)
Future income taxes		(1,897,340)		(733,855)		(3,340,516)
Future net cash flows		6,408,831		3,767,950		8,448,740
Discount at 10%		(3,220,862)		(1,873,633)		(4,652,684)
Standardized measure of discounted
future net cash flows	$	3,187,969	$	1,894,317	$	3,796,056

Summary of changes in the standardized measure of discounted future net cash flows

		December 31,
		2013		2012		2011
Standardized measure, beginning	$	1,894,317	$	3,796,056	$	3,525,568
Net revisions of previous quantity estimates		(1,089,316)		(2,516,159)		(964,987)
Extensions, discoveries and other changes		2,098,644		858,951		2,173,103
Acquisition of reserves		86,196		-		-
Changes in future development costs		(252,992)		952,067		(741,658)
Sales of oil and gas, net of production costs		(720,826)		(625,745)		(896,434)
Net change in prices and production costs		1,204,041		(2,912,698)		108,108
Development costs incurred during the
period that reduce future development costs		171,149		316,394		464,880
Accretion of discount		226,326		529,696		499,358
Net changes in production rates and other		145,289		363,788		(338,982)
Net change in income taxes		(574,859)		1,131,967		(32,900)
Aggregate changes		1,293,652		(1,901,739)		270,488
Standardized measure, ending	$	3,187,969	$	1,894,317	$	3,796,056

Costs incurred in oil and gas exploration and development activities

		Years Ended December 31,
		2013		2012		2011
United States
Property Acquisitions:
Unproved	$	424,540	$	47,979	$	91,983
Proved		224,410		-		-
Exploration*		184,007		199,569		746,085
Development		186,755		587,618		675,718
Total	$	1,019,712	$	835,166	$	1,513,786
* Exploration costs (as defined in Regulation S-X) includes costs spent on development of unproved reserves in the Pinedale Field.

Results of operations for oil and gas producing activities

F. RESULTS OF OPERATIONS FOR OIL AND GAS PRODUCING ACTIVITIES:
			Years Ended December 31,
			2013		2012		2011
	United States
	Oil and gas revenue	$	933,404	$	809,974	$	1,101,796
	Production expenses		(212,578)		(184,229)		(205,363)
	Depletion and depreciation		(243,390)		(388,985)		(346,394)
	Ceiling test and other impairments		-		(2,972,464)		-
	Income taxes		(2,821)		662,698		(197,464)
	Total	$	474,615	$	(2,073,006)	$	352,575

Capitalized Costs Relating to Oil and Gas Producing Activities

		December 31,		December 31,
		2013		2012
Proven Properties:
Acquisition, equipment, exploration, drilling and environmental costs(3)	$	7,817,374	$	7,235,765
Less: Accumulated depletion, depreciation and amortization(1)		(5,808,836)		(5,578,265)
		2,008,538		1,657,500
Unproven Properties:
Acquisition and exploration costs not being amortized (2), (3)		413,073		-
Net capitalized costs - oil and gas properties	$	2,421,611	$	1,657,500

G. CAPITALIZED COSTS RELATING TO OIL AND GAS PRODUCING ACTIVITIES:
			December 31,
			2013		2012
	Proven Properties:
	Acquisition, equipment, exploration, drilling and
	environmental costs	$	7,817,374	$	7,235,765
	Less: accumulated depletion, depreciation and amortization		(5,808,836)		(5,578,265)
			2,008,538		1,657,500
	Unproven Properties:
	Acquisition and exploration costs not being amortized		413,073		-
		$	2,421,611	$	1,657,500