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Disclosures About Oil and Gas Producing Activities (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Oil And Gas Exploration And Production Industries Disclosures [Abstract]  
Analyses of changes in proven reserves
United States
OilNatural GasNGLs
(MBbls)(MMcf)(MBbls)
Reserves, December 31, 201218,1372,966,445-
Extensions, discoveries and additions11,3291,409,528-
Acquistions10,114--
Production(1,196)(224,912)-
Revisions(4,265)(741,319)-
Reserves, December 31, 201334,1193,409,742-
Extensions, discoveries and additions34,275866,513210
Sales-(239,290)-
Acquistions9,3811,345,96421,740
Production(3,409)(228,517)-
Revisions(6,600)(323,218)43
Reserves, December 31, 201467,7664,831,19421,993
Extensions, discoveries and additions16617,4153
Sales---
Acquistions---
Production(3,533)(268,954)-
Revisions(42,224)(2,243,375)(12,156)
Reserves, December 31, 201522,1752,336,2809,840
United States
OilNatural GasNGLs
(MBbls)(MMcf)(MBbls)
Proved:
Developed10,5311,820,994-
Undeveloped7,6061,145,451-
Total Proved - 201218,1372,966,445-
Developed20,5661,777,267-
Undeveloped13,5531,632,475-
Total Proved - 201334,1193,409,742-
Developed28,4812,245,0049,118
Undeveloped39,2852,586,19012,875
Total Proved - 201467,7664,831,19421,993
Developed22,1752,336,2809,840
Undeveloped---
Total Proved - 201522,1752,336,2809,840
Standardized measure
As of December 31,
201520142013
Future cash inflows$6,312,095$27,331,391$14,861,131
Future production costs(3,006,265)(8,627,657)(4,540,209)
Future development costs(358,848)(3,859,385)(2,014,751)
Future income taxes-(3,898,355)(1,897,340)
Future net cash flows2,946,98210,945,9946,408,831
Discount at 10%(1,081,333)(5,712,511)(3,220,862)
Standardized measure of discounted
future net cash flows$1,865,649$5,233,483$3,187,969
Summary of changes in the standardized measure of discounted future net cash flows
December 31,
201520142013
Standardized measure, beginning$5,233,483$3,187,969$1,894,317
Net revisions of previous quantity estimates(2,126,998)(603,795)(1,089,316)
Extensions, discoveries and other changes15,2541,787,6432,098,644
Sales of reserves in place-(398,506)-
Acquisition of reserves-2,552,49186,196
Changes in future development costs1,618,068(1,013,652)(252,992)
Sales of oil and gas, net of production costs(550,879)(949,389)(720,826)
Net change in prices and production costs(6,996,416)1,010,0521,204,041
Development costs incurred during the
period that reduce future development costs548,112342,987171,149
Accretion of discount709,736413,177226,326
Net changes in production rates and other1,551,413(175,419)145,289
Net change in income taxes1,863,876(920,075)(574,859)
Aggregate changes(3,367,834)2,045,5141,293,652
Standardized measure, ending$1,865,649$5,233,483$3,187,969
Costs incurred in oil and gas exploration and development activities
Years Ended December 31,
201520142013
United States
Property Acquisitions:
Unproved$13,845$26,106$424,540
Proved-895,179224,410
Exploration*18,164197,664184,007
Development461,458382,984186,755
Total$493,467$1,501,933$1,019,712
* 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,
201520142013
United States
Oil and gas revenue$839,111$1,230,020$933,404
Production expenses(288,231)(280,631)(212,578)
Depletion and depreciation(401,200)(292,951)(243,390)
Ceiling test and other impairments(3,144,899)--
Income tax benefit (expense)(9,841)3,736(2,821)
Total$(3,005,060)$660,174$474,615
Capitalized Costs Relating to Oil and Gas Producing Activities
December 31,December 31,
20152014
Proven Properties:
Acquisition, equipment, exploration, drilling and environmental costs (1)$10,480,165$9,731,407
Less: Accumulated depletion, depreciation and amortization (2)(9,629,020)(6,094,764)
851,1453,636,643
Unproven Properties:
Acquisition and exploration costs not being amortized (3), (4)-242,294
Net capitalized costs - oil and gas properties$851,145$3,878,937

(1) On September 25, 2014, a wholly owned subsidiary of Ultra Petroleum Corp. completed the acquisition of all producing and non-producing properties in the Pinedale field in Sublette County, Wyoming in exchange for certain of the Company’s producing and non-producing properties in Pennsylvania and a cash payment.

(2) During 2015, the Company recorded a $3.1 billion non-cash write-down of the carrying value of the Company’s proved oil and gas properties as a result of ceiling test limitations, which is reflected within ceiling test and other impairments in the accompanying Consolidated Statements of Operations. The ceiling test was calculated based upon the average of quoted market prices in effect on the first day of the month for the preceding twelve month period at December 31, 2015 for Henry Hub natural gas and West Texas Intermediate oil, adjusted for market differentials.

(3) Interest is capitalized on the cost of unevaluated oil and natural gas properties that are excluded from amortization and actively being evaluated as well as on work in process relating to gathering systems that are not currently in service. For the years ended December 31, 2015 and 2014, total interest on outstanding debt was $185.0 million and $146.6 million, respectively, of which $13.1 million and $20.4 million, respectively, was capitalized on the cost of unevaluated oil and natural gas properties and work in process relating to gathering systems that are not currently in service.

(4) At December 31, 2015, all costs related to unevaluated properties that were previously excluded from capitalized costs being amortized have been impaired and transferred to the capitalized costs being amortized in the full cost pool.

G. CAPITALIZED COSTS RELATING TO OIL AND GAS PRODUCING ACTIVITIES:
December 31,
20152014
Proven Properties:
Acquisition, equipment, exploration, drilling and
environmental costs$10,480,165$9,731,407
Less: accumulated depletion, depreciation and amortization(9,629,020)(6,094,764)
851,1453,636,643
Unproven Properties:
Acquisition and exploration costs not being amortized-242,294
$851,145$3,878,937