10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended June 30, 2011
or
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from          to

Commission file number 001-33614

ULTRA PETROLEUM CORP.

(Exact name of registrant as specified in its charter)

Yukon Territory, Canada (State or other jurisdiction of incorporation or organization)	N/A (I.R.S. employer identification number)
363 North Sam Houston Parkway E., Suite 1200, Houston, Texas (Address of principal executive offices)	77060 (Zip code)

(281) 876-0120
(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  YES þ     NO o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  YES þ     NO o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer þ Accelerated filer o Non-accelerated filer o Smaller reporting company o

(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  YES o     NO þ

The number of common shares, without par value, of Ultra Petroleum Corp., outstanding as of August 1, 2011 was 152,923,374.

TABLE OF CONTENTS

PART I — FINANCIAL INFORMATION
	Item 1.	Financial Statements	3
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	15
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	22
	Item 4.	Controls and Procedures	23
PART II — OTHER INFORMATION
	Item 1.	Legal Proceedings	24
	Item 1A.	Risk Factors	24
	Item 2.	Changes in Securities and Use of Proceeds	24
	Item 3.	Defaults upon Senior Securities	24
	Item 4.	[Removed and Reserved]	24
	Item 5.	Other Information	24
	Item 6.	Exhibits	25
		Signatures	26
		Exhibit Index	26
EX-31.1
EX-31.2
EX-32.1
EX-32.2
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT

2

Part I — Financial Information

Item 1 — Financial Statements

ULTRA PETROLEUM CORP.

CONSOLIDATED STATEMENTS OF INCOME

	For the Three Months						For the Six Months
	Ended June 30,						Ended June 30,
	2011			2010			2011			2010
	(Amounts in thousands, except per share data)
				(Unaudited)
Revenues:
Natural gas sales	$	249,835		$	206,208		$	481,751		$	456,955
Oil sales		30,732			22,180			56,107			44,557
Total operating revenues		280,567			228,388			537,858			501,512
Expenses:
Lease operating expenses		11,115			11,534			23,472			21,858
Production taxes		24,846			22,487			48,119			50,893
Gathering fees		13,910			12,498			26,917			24,453
Transportation charges		16,273			16,522			32,431			32,427
Depletion, depreciation and amortization		79,219			56,853			152,978			108,120
General and administrative		6,002			6,105			13,113			12,507
Total operating expenses		151,365			125,999			297,030			250,258
Operating income		129,202			102,389			240,828			251,254
Other income (expense), net:
Interest expense		(15,590	)		(11,437	)		(30,180	)		(23,156	)
Gain on commodity derivatives		47,606			14,566			63,241			195,917
Litigation expense		—			(9,902	)		—			(9,902	)
Other (expense) income, net		(4	)		22			16			173
Total other income (expense), net		32,012			(6,751	)		33,077			163,032
Income before income tax provision		161,214			95,638			273,905			414,286
Income tax provision		57,709			34,145			101,679			150,417
Net income	$	103,505		$	61,493		$	172,226		$	263,869
Net income per common share — basic	$	0.68		$	0.40		$	1.13		$	1.73
Net income per common share — fully diluted	$	0.67		$	0.40		$	1.11		$	1.71
Weighted average common shares outstanding — basic		152,899			152,300			152,749			152,187
Weighted average common shares outstanding — fully diluted		154,377			154,310			154,498			154,268

See accompanying notes to consolidated financial statements.

3

ULTRA PETROLEUM CORP.

CONSOLIDATED BALANCE SHEETS

	June 30,			December 31,
	2011			2010
	(Unaudited)
	(Amounts in thousands of
	U.S. dollars, except share data)
ASSETS
Current Assets:
Cash and cash equivalents	$	6,698		$	70,834
Restricted cash		98			98
Oil and gas revenue receivable		93,702			95,142
Joint interest billing and other receivables		62,337			48,561
Derivative assets		93,922			133,991
Inventory		2,883			2,760
Prepaid drilling costs and other current assets		7,787			9,663
Total current assets		267,427			361,049
Oil and gas properties, net, using the full cost method of accounting:
Proved		3,106,966			2,589,423
Unproved properties not being amortized		524,307			486,247
Property, plant and equipment		168,376			149,104
Long-term derivative assets		10,785			2,066
Deferred financing costs and other		7,257			7,726
Total assets	$	4,085,118		$	3,595,615
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable and accrued liabilities	$	236,582		$	210,311
Current portion of long-term debt		154,000			—
Production taxes payable		61,758			53,382
Deferred tax liabilities		26,980			42,685
Interest payable		29,806			26,878
Derivative liabilities		—			718
Capital cost accrual		111,200			84,042
Total current liabilities		620,326			418,016
Long-term debt		1,560,000			1,560,000
Deferred income tax liabilities		526,992			420,711
Long-term derivative liabilities		1,583			5,337
Other long-term obligations		59,369			52,575
Commitments and contingencies
Shareholders’ equity:
Common stock — no par value; authorized — unlimited; issued and outstanding — 152,922,524 and 152,567,813 at June 30, 2011 and December 31, 2010, respectively		452,356			426,779
Treasury stock		(379	)		—
Retained earnings		864,871			712,197
Total shareholders’ equity		1,316,848			1,138,976
Total liabilities and shareholders’ equity	$	4,085,118		$	3,595,615

See accompanying notes to consolidated financial statements.

4

ULTRA PETROLEUM CORP.

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Six Months Ended
	June 30,
	2011			2010
	(Unaudited)
	(Amounts in thousands of
	U.S. dollars)
Cash provided by (used in):
Operating activities:
Net income for the period	$	172,226		$	263,869
Adjustments to reconcile net income to cash provided by operating activities:
Depletion and depreciation		152,978			108,120
Deferred income taxes		97,128			147,916
Unrealized loss (gain) on commodity derivatives		26,879			(158,932	)
Excess tax benefit from stock based compensation		(6,552	)		(16,420	)
Stock compensation		6,446			6,137
Other		521			271
Net changes in operating assets and liabilities:
Restricted cash		—			(82	)
Accounts receivable		(12,336	)		(23,763	)
Prepaid expenses and other		(1,571	)		(3,911	)
Other non-current assets		7			2,905
Accounts payable, production taxes, interest payable and accrued liabilities		38,129			37,891
Other long-term obligations		327			8,181
Taxation payable/receivable, net		3,198			—
Net cash provided by operating activities		477,380			372,182
Investing Activities:
Acquisition of oil and gas properties		—			(332,970	)
Oil and gas property expenditures		(695,810	)		(539,783	)
Gathering system expenditures		(21,417	)		(32,979	)
Restricted cash		—			28,257
Change in capital cost accrual		27,158			48,324
Proceeds from sale of oil and gas properties		—			68,420
Inventory		(123	)		1,006
Purchase of capital assets		(489	)		(342	)
Net cash used in investing activities		(690,681	)		(760,067	)
Financing activities:
Borrowings on long-term debt		504,000			583,000
Payments on long-term debt		(350,000	)		(697,000	)
Proceeds from issuance of Senior Notes		—			500,000
Deferred financing costs		—			(2,265	)
Repurchased shares/net share settlements		(20,629	)		(23,707	)
Excess tax benefit from stock based compensation		6,552			16,420
Proceeds from exercise of options		9,242			5,512
Net cash provided by financing activities		149,165			381,960
Decrease in cash during the period		(64,136	)		(5,925	)
Cash and cash equivalents, beginning of period		70,834			14,254
Cash and cash equivalents, end of period	$	6,698		$	8,329

See accompanying notes to consolidated financial statements.

5

ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(All amounts in this Quarterly Report on Form 10-Q are expressed in thousands of U.S. dollars (except per share data) unless otherwise noted)

DESCRIPTION OF THE BUSINESS:

Ultra Petroleum Corp. (the “Company”) is an independent oil and gas company engaged in the development, production, operation, exploration and acquisition of oil and natural gas properties. The Company is incorporated under the laws of the Yukon Territory, Canada. The Company’s principal business activities are conducted in the Green River Basin of Southwest Wyoming and in the north-central Pennsylvania area of the Appalachian Basin.

1.   SIGNIFICANT ACCOUNTING POLICIES:

The accompanying financial statements, other than the balance sheet data as of December 31, 2010, are unaudited and were prepared from the Company’s records, but do not include all disclosures required by U.S. Generally Accepted Accounting Principles (“GAAP”). Balance sheet data as of December 31, 2010 was derived from the Company’s audited financial statements. The Company’s management believes that these financial statements include all adjustments necessary for a fair presentation of the Company’s financial position and results of operations. All adjustments are of a normal and recurring nature unless specifically noted. The Company prepared these statements on a basis consistent with the Company’s annual audited statements and Regulation S-X. Regulation S-X allows the Company to omit some of the footnote and policy disclosures required by generally accepted accounting principles and normally included in annual reports on Form 10-K. You should read these interim financial statements together with the financial statements, summary of significant accounting policies and notes to the Company’s most recent annual report on Form 10-K.

Basis of presentation and principles of consolidation:  The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. The Company presents its financial statements in accordance with U.S. GAAP. All inter-company transactions and balances have been eliminated upon consolidation.

(a) Cash and Cash Equivalents:  The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

(b) Restricted Cash:  Restricted cash represents cash received by the Company from production sold where the final division of ownership of the production is unknown or in dispute.

(c) Property, Plant and Equipment:  Capital assets are recorded at cost and depreciated using the declining-balance method based on a seven-year useful life. Gathering system expenditures are recorded at cost and depreciated using the straight-line method based on a 30-year useful life.

(d) Oil and Natural Gas Properties:  The Company uses the full cost method of accounting for exploration and development activities as defined by the Securities and Exchange Commission (“SEC”) Release No. 33-8995, Modernization of Oil and Gas Reporting Requirements (“SEC Release No. 33-8995”) and Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 932, Extractive Activities — Oil and Gas (“FASB ASC 932”). Under this method of accounting, the costs of unsuccessful, as well as successful, exploration and development activities are capitalized as oil and gas properties. This includes any internal costs that are directly related to exploration and development activities but does not include any costs related to production, general corporate overhead or similar activities. The carrying amount of oil and natural gas properties also includes estimated asset retirement costs recorded based on the fair value of the asset retirement obligation when incurred. Gain or loss on the sale or other disposition of oil and natural gas properties is not recognized, unless the gain or loss would significantly alter the relationship between capitalized costs and proved reserves of oil and natural gas attributable to a country.

6

ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The sum of net capitalized costs and estimated future development costs of oil and natural gas properties are amortized using the units-of-production method based on the Company’s proved reserves. Oil and natural gas reserves and production are converted into equivalent units based on relative energy content. Asset retirement obligations are included in the base costs for calculating depletion.

Under the full cost method, costs of unevaluated properties and major development projects expected to require significant future costs may be excluded from capitalized costs being amortized. The Company excludes significant costs until proved reserves are found or until it is determined that the costs are impaired. Excluded costs, if any, are reviewed quarterly to determine if impairment has occurred. The amount of any impairment is transferred to the capitalized costs being amortized.

Companies that use the full cost method of accounting for oil and natural gas exploration and development activities are required to perform a ceiling test calculation each quarter. The full cost ceiling test is an impairment test prescribed by SEC Regulation S-X Rule 4-10. The ceiling test is performed quarterly, on a country-by-country basis, utilizing the average of prices in effect on the first day of the month for the preceding twelve month period in accordance with SEC Release No. 33-8995. The ceiling limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved crude oil and natural gas reserves discounted at 10%, plus the lower of cost or market value of unproved properties less any associated tax effects. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to earnings. Any such write-down will reduce earnings in the period of occurrence and results in a lower DD&A rate in future periods. A write-down may not be reversed in future periods even though higher oil and natural gas prices may subsequently increase the ceiling.

(e) Inventories:  Materials and supplies inventories are carried at cost. Inventory costs include expenditures and other charges directly and indirectly incurred in bringing the inventory to its existing condition and location. The Company uses the weighted average method of recording its inventory. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory cost. At June 30, 2011, inventory of $2.9 million primarily included the cost of pipe and production equipment that are expected to be utilized during the 2011 drilling program.

(f) Derivative Instruments and Hedging Activities:  Currently, the Company largely relies on commodity derivative contracts to manage its exposure to commodity price risk. These commodity derivative contracts are typically referenced to natural gas index prices as published by independent third parties. Additionally, and from time to time, the Company enters into physical, fixed price forward natural gas sales in order to mitigate its commodity price exposure on a portion of its natural gas production. These fixed price forward natural gas sales are considered normal sales in the ordinary course of business and outside the scope of FASB ASC Topic 815, Derivatives and Hedging (“FASB ASC 815”). The Company does not offset the value of its derivative arrangements with the same counterparty. (See Note 6).

(g) Income Taxes:  Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are recorded related to deferred tax assets based on the “more likely than not” criteria described in FASB ASC Topic 740, Income Taxes. In addition, the Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit.

(h) Earnings Per Share:  Basic earnings per share is computed by dividing net earnings attributable to common stockholders by the weighted average number of common shares outstanding during each period. Diluted

7

ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

earnings per share is computed by adjusting the average number of common shares outstanding for the dilutive effect, if any, of common stock equivalents. The Company uses the treasury stock method to determine the dilutive effect.

	Three Months Ended				Six Months Ended
	June 30,		June 30,		June 30,		June 30,
	2011		2010		2011		2010
	(Share amounts in 000’s)
Net income	$	103,505	$	61,493	$	172,226	$	263,869
Weighted average common shares outstanding — basic		152,899		152,300		152,749		152,187
Effect of dilutive instruments		1,478		2,010		1,749		2,081
Weighted average common shares outstanding — fully diluted		154,377		154,310		154,498		154,268
Net income per common share — basic	$	0.68	$	0.40	$	1.13	$	1.73
Net income per common share — fully diluted	$	0.67	$	0.40	$	1.11	$	1.71
Number of shares not included in dilutive earnings per share that would have been anti-dilutive because the exercise price was greater than the average market price of the common shares		935		1,002		935		1,002

(i) Use of Estimates:  Preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

(j) Accounting for Share-Based Compensation:  The Company measures and recognizes compensation expense for all share-based payment awards made to employees and directors, including employee stock options, based on estimated fair values in accordance with FASB ASC Topic 718, Compensation — Stock Compensation.

(k) Fair Value Accounting:  The Company follows FASB ASC Topic 820, Fair Value Measurements and Disclosures (“FASB ASC 820”), which defines fair value, establishes a framework for measuring fair value under GAAP, and expands disclosures about fair value measurements. This statement applies under other accounting topics that require or permit fair value measurements. See Note 7 for additional information.

(l) Asset Retirement Obligation:  The initial estimated retirement obligation of properties is recognized as a liability with an associated increase in oil and gas properties for the asset retirement cost. Accretion expense is recognized over the estimated productive life of the related assets. If the fair value of the estimated asset retirement obligation changes, an adjustment is recorded to both the asset retirement obligation and the asset retirement cost. Revisions in estimated liabilities can result from changes in service and equipment costs and changes in the estimated timing of settling asset retirement obligations.

(m) Revenue Recognition:  Natural gas revenues are recorded based on the entitlement method. Under the entitlement method, revenue is recorded when title passes based on the Company’s net revenue interest. The Company initially records its entitled share of revenues based on estimated production volumes. Subsequently, these estimated volumes are adjusted to reflect actual volumes that are supported by third party pipeline statements or cash receipts. Since there is a ready market for natural gas, the Company sells the majority of its products immediately after production at various locations at which time title and risk of loss pass to the buyer. Gas imbalances occur when the Company sells more or less than its entitled ownership percentage of total gas

8

ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

production. Any amount received in excess of the Company’s share is treated as a liability. If the Company receives less than its entitled share, the underproduction is recorded as a receivable.

(n) Capitalized Interest:  Interest is capitalized on the cost of unevaluated gas and oil 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.

(o) Capital Cost Accrual:  The Company accrues for exploration and development costs in the period incurred, while payment may occur in a subsequent period.

2.   OIL AND GAS PROPERTIES:

	June 30,			December 31,
	2011			2010
Developed Properties:
Acquisition, equipment, exploration, drilling and environmental costs	$	5,241,709		$	4,575,222
Less: Accumulated depletion, depreciation and amortization		(2,134,743	)		(1,985,799	)
		3,106,966			2,589,423
Unproven Properties:
Acquisition and exploration costs not being amortized(1)		524,307			486,247
Net capitalized costs — oil and gas properties	$	3,631,273		$	3,075,670

(1) For the six months ended June 30, 2011 and 2010, total interest on outstanding debt was $45.7 million and $30.5 million, respectively, of which, $15.5 million and $7.4 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.

3.   DEBT AND OTHER LONG-TERM OBLIGATIONS:

	June 30,		December 31,
	2011		2010
Short-term debt:
Bank indebtedness	$	154,000	$	—
Long-term debt:
Senior Notes		1,560,000		1,560,000
Other long-term obligations		59,369		52,575
Total long-term obligations	$	1,619,369	$	1,612,575

Bank indebtedness:  The Company (through its subsidiary) is a party to a revolving credit facility with a syndicate of banks led by JP Morgan Chase Bank, N.A. which matures in April 2012. Currently, the Company anticipates replacing this facility prior to its maturity in 2012.

This agreement provides an initial loan commitment of $500.0 million and may be increased to a maximum aggregate amount of $750.0 million at the request of the Company. Each bank has the right, but not the obligation, to increase the amount of its commitment as requested by the Company. In the event the existing banks increase their commitment to an amount less than the requested commitment amount, then it would be necessary to add new financial institutions to the credit facility.

Loans under the credit facility are unsecured and bear interest, at the Company’s option, based on (A) a rate per annum equal to the higher of the prime rate or the weighted average fed funds rate on overnight transactions during

9

ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

the preceding business day plus 50 basis points, or (B) a base Eurodollar rate, substantially equal to the LIBOR rate, plus a margin based on a grid of the Company’s consolidated leverage ratio (125 basis points per annum as of June 30, 2011).

At June 30, 2011, the Company had $154.0 million in outstanding borrowings and $346.0 million of available borrowing capacity under the credit facility.

The facility has restrictive covenants that include the maintenance of a ratio of consolidated funded debt to EBITDAX (earnings before interest, taxes, DD&A and exploration expense) not to exceed three and one half times; and as long as the Company’s debt rating is below investment grade, the maintenance of an annual ratio of the net present value of the Company’s oil and gas properties to total funded debt of at least 1.75 to 1.00. At June 30, 2011, the Company was in compliance with all of its debt covenants under the credit facility.

Senior Notes:  At June 30, 2011, the Company had $1.56 billion in outstanding Senior Notes. The Senior Notes rank pari passu with the Company’s bank credit facility. Payment of the Senior Notes is guaranteed by Ultra Petroleum Corp. and UP Energy Corporation. The Senior Notes are pre-payable in whole or in part at any time and are subject to representations, warranties, covenants and events of default customary for a senior note financing. At June 30, 2011, the Company was in compliance with all of its debt covenants under the Master Note Purchase Agreement.

Other long-term obligations:  These costs primarily relate to the long-term portion of production taxes payable and asset retirement obligations.

4.   SHARE BASED COMPENSATION:

Valuation and Expense Information

	Three Months				Six Months
	Ended June 30,				Ended June 30,
	2011		2010		2011		2010
Total cost of share-based payment plans	$	5,007	$	5,809	$	10,131	$	10,494
Amounts capitalized in fixed assets	$	1,683	$	2,453	$	3,685	$	4,357
Amounts charged against income, before income tax benefit	$	3,324	$	3,356	$	6,446	$	6,137
Amount of related income tax benefit recognized in income	$	1,193	$	1,191	$	2,314	$	2,179

10

ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Changes in Stock Options and Stock Options Outstanding

The following table summarizes the changes in stock options for the six months ended June 30, 2011 and the year ended December 31, 2010:

				Weighted
	Number of			Average
	Options			Exercise Price
	(000’s)			(US$)
Balance, December 31, 2009		3,504		$	1.49	to	$	98.87
Forfeited		(68	)	$	51.60	to	$	76.01
Exercised		(1,206	)	$	1.49	to	$	45.95
Balance, December 31, 2010		2,230		$	3.91	to	$	98.87
Forfeited		(2	)	$	51.60	to	$	75.18
Exercised		(645	)	$	3.91	to	$	33.57
Balance, June 30, 2011		1,583		$	11.68	to	$	98.87

PERFORMANCE SHARE PLANS:

Long Term Incentive Plans.  The Company offers a Long Term Incentive Plan (“LTIP”) in order to further align the interests of key employees with shareholders and to give key employees the opportunity to share in the long-term performance of the Company when specific corporate financial and operational goals are achieved. Each LTIP covers a performance period of three years. In 2009, 2010 and 2011, the Compensation Committee (the “Committee”) approved an award consisting of performance-based restricted stock units to be awarded to each participant.

For each LTIP award, the Committee establishes performance measures at the beginning of each performance period. Under each LTIP, the Committee establishes a percentage of base salary for each participant which is multiplied by the participant’s base salary to derive a Long Term Incentive Value as a “target” value which corresponds to the number of shares of the Company’s common stock the participant is eligible to receive if the target level for all performance measures is met. In addition, each participant is assigned threshold and maximum award levels in the event that actual performance is below or above target levels. For the 2009, 2010 and 2011 LTIP awards, the Committee established the following performance measures: return on equity, reserve replacement ratio, and production growth.

For the six months ended June 30, 2011, the Company recognized $5.0 million in pre-tax compensation expense related to the 2009, 2010 and 2011 LTIP awards of restricted stock units as compared to $3.8 million during the six months ended June 30, 2010 related to the 2008, 2009 and 2010 LTIP awards of restricted stock units. The amounts recognized during the six months ended June 30, 2011 assumes that maximum performance objectives are attained. If the Company ultimately attains these performance objectives, the associated total compensation, estimated at June 30, 2011, for each of the three year performance periods is expected to be approximately $23.5 million, $11.4 million, and $11.0 million related to the 2009, 2010 and 2011 LTIP awards of restricted stock units, respectively. The 2008 LTIP award of restricted stock units was paid in shares of the Company’s stock to employees during the first quarter of 2011 and totaled $4.3 million (41,443 net shares).

5.   INCOME TAXES:

During the quarter ended June 30, 2011, the Company recorded an income tax provision of $57.7 million, or 35.8% of income before income tax provision. This compares to an income tax provision of $34.1 million, or 35.7% of income before income tax provision for the quarter ended June 30, 2010. The effective tax rate increased over the

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ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

comparable prior period primarily due to elevated activity levels in the higher state tax jurisdiction of Pennsylvania which increased the overall effective tax rate to 35.9%.

During the six months ended June 30, 2011, the Company recorded an income tax provision of $101.7 million, or 37.1% of income before income tax provision. This compares to an income tax provision of $150.4 million, or 36.3% of income before income tax provision for the six months ended June 30, 2010. The effective tax rate increased over the comparable prior period primarily due to elevated activity levels in the higher state tax jurisdiction of Pennsylvania as the higher effective tax rate is now being applied to the Company’s prior temporary differences which increased the overall effective tax rate to 35.9%.

6.   DERIVATIVE FINANCIAL INSTRUMENTS:

Objectives and Strategy:  The Company’s major market risk exposure is in the pricing applicable to its natural gas and oil production. Realized pricing is currently driven primarily by the prevailing price for the Company’s natural gas production. Historically, prices received for natural gas production have been volatile and unpredictable. Pricing volatility is expected to continue. As a result of its hedging activities, the Company may realize prices that are less than or greater than the spot prices that it would have received otherwise.

The Company relies on various types of derivative instruments to manage its exposure to commodity price risk and to provide a level of certainty in the Company’s forward cash flows supporting the Company’s capital investment program.

The Company’s hedging policy limits the amounts of resources hedged to not more than 50% of its forecast production without Board approval. The Board has approved hedging greater than 50% of the Company’s forecast 2011 production.

Fair Value of Commodity Derivatives:  FASB ASC 815 requires that all derivatives be recognized on the balance sheet as either an asset or liability and be measured at fair value. Changes in the derivative’s fair value are recognized currently in earnings unless specific hedge accounting criteria are met. The Company does not apply hedge accounting to any of its derivative instruments.

Derivative contracts that do not qualify for hedge accounting treatment are recorded as derivative assets and liabilities at fair value on the balance sheet and the associated unrealized gains and losses are recorded as current income or expense in the income statement. Unrealized gains or losses on commodity derivatives represent the non-cash change in the fair value of these derivative instruments and do not impact operating cash flows on the cash flow statement. See Note 7 for the detail of the asset and liability values of the following derivatives.

Commodity Derivative Contracts:  At June 30, 2011, the Company had the following open commodity derivative contracts to manage price risk on a portion of its natural gas production whereby the Company receives the fixed price and pays the variable price. The natural gas reference prices of these commodity derivative contracts are typically referenced to natural gas index prices as published by independent third parties.

	Commodity	Remaining					Fair Value -
	Reference	Contract	Volume -		Average		June 30,
Type	Price	Period	MMBTU/Day		Price/MMBTU		2011
							Asset
Swap	NW Rockies	Calendar 2011		170,000	$	5.08	$	26,980
Swap	NYMEX	July — October 2011		230,000	$	4.58	$	5,538
Swap	NYMEX	Calendar 2012		300,000	$	5.03	$	21,644
Swap	NYMEX	April — October 2012		90,000	$	5.00	$	4,668
Swap	Northeast	Calendar 2011		195,000	$	5.81	$	44,294

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ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes the pre-tax realized and unrealized gains and losses the Company recognized related to its natural gas derivative instruments in the Consolidated Statements of Income for the six months ended June 30, 2011 and 2010:

	For the Three Months					For the Six Months
	Ended June 30,					Ended June 30,
	2011		2010			2011			2010
Natural Gas Commodity Derivatives:
Realized gain on commodity derivatives(1)	$	45,080	$	37,654		$	90,120		$	36,985
Unrealized gain (loss) on commodity derivatives(1)		2,526		(23,088	)		(26,879	)		158,932
Total gain on commodity derivatives	$	47,606	$	14,566		$	63,241		$	195,917

(1) Included in gain on commodity derivatives in the Consolidated Statements of Income.

7.   FAIR VALUE MEASUREMENTS:

As required by FASB ASC 820, the Company defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and establishes a three level hierarchy for measuring fair value. Fair value measurements are classified and disclosed in one of the following categories:

Level 1:  Quoted prices (unadjusted) in active markets for identical assets and liabilities that the Company has the ability to access at the measurement date.

Level 2:  Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable for the asset or liability, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived from observable market data by correlation or other means. Instruments categorized in Level 2 include non-exchange traded derivatives such as over-the-counter forwards and swaps.

Level 3:  Unobservable inputs for the asset or liability, including situations where there is little, if any, market activity for the asset or liability.

The valuation assumptions utilized to measure the fair value of the Company’s commodity derivatives were observable inputs based on market data obtained from independent sources and are considered Level 2 inputs (quoted prices for similar assets, liabilities (adjusted) and market-corroborated inputs).

The following table presents for each hierarchy level the Company’s assets and liabilities, including both current and non-current portions, measured at fair value on a recurring basis, as of June 30, 2011. The Company has no derivative instruments which qualify for cash flow hedge accounting.

	Level 1		Level 2		Level 3		Total
Assets:
Current derivative asset	$	—	$	93,922	$	—	$	93,922
Non-current derivative asset	$	—	$	10,785	$	—	$	10,785
Liabilities:
Non-current derivative liability	$	—	$	1,583	$	—	$	1,583

In consideration of counterparty credit risk, the Company assessed the possibility of whether each counterparty to the derivative would default by failing to make any contractually required payments as scheduled in the derivative instrument in determining the fair value. Additionally, the Company considers that it is of substantial credit quality

13

ULTRA PETROLEUM CORP.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

and has the financial resources and willingness to meet its potential repayment obligations associated with the derivative transactions.

Fair Value of Financial Instruments

The estimated fair value of financial instruments is the estimated amount at which the instrument could be exchanged currently between willing parties. The carrying amounts reported in the consolidated balance sheet for cash and cash equivalents, accounts receivable, accounts payable and current portion of long-term debt approximate fair value due to the immediate or short-term maturity of these financial instruments. The Company uses available market data and valuation methodologies to estimate the fair value of debt. This disclosure is presented in accordance with FASB ASC Topic 825, Financial Instruments, and does not impact the Company’s financial position, results of operations or cash flows.

	June 30, 2011				December 31, 2010
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Long-Term Debt:
5.45% Notes due 2015, issued 2008	$	100,000	$	112,501	$	100,000	$	108,572
7.31% Notes due 2016, issued 2009		62,000		75,205		62,000		72,153
4.98% Notes due 2017, issued 2010		116,000		127,011		116,000		119,385
5.92% Notes due 2018, issued 2008		200,000		227,391		200,000		212,660
7.77% Notes due 2019, issued 2009		173,000		216,729		173,000		203,051
5.50% Notes due 2020, issued 2010		207,000		224,180		207,000		206,233
4.51% Notes due 2020, issued 2010		315,000		313,221		315,000		284,207
5.60% Notes due 2022, issued 2010		87,000		92,417		87,000		84,818
4.66% Notes due 2022, issued 2010		35,000		34,140		35,000		30,989
5.85% Notes due 2025, issued 2010		90,000		96,180		90,000		87,211
4.91% Notes due 2025, issued 2010		175,000		169,343		175,000		152,064
	$	1,560,000	$	1,688,318	$	1,560,000	$	1,561,343

8.   LEGAL PROCEEDINGS:

The Company is currently involved in various routine disputes and allegations incidental to its business operations. While it is not possible to determine the ultimate disposition of these matters, the Company believes that the resolution of all such pending or threatened litigation is not likely to have a material adverse effect on the Company’s financial position or results of operations.

9.   SUBSEQUENT EVENTS:

FASB ASC Topic 855, Subsequent Events (“FASB ASC 855”), sets forth principles and requirements to be applied to the accounting for and disclosure of subsequent events. FASB ASC 855 sets forth the period after the balance sheet date during which management shall evaluate events or transactions that may occur for potential recognition or disclosure in the financial statements, the circumstances under which events or transactions occurring after the balance sheet date shall be recognized in the financial statements and the required disclosures about events or transactions that occurred after the balance sheet date. The Company has evaluated the period subsequent to June 30, 2011 for events that did not exist at the balance sheet date but arose after that date and determined that no subsequent events arose that should be disclosed in order to keep the financial statements from being misleading.

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Item 2 — Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion of the financial condition and operating results of the Company should be read in conjunction with the Company’s consolidated financial statements and related notes. Except as otherwise indicated, all amounts are expressed in U.S. dollars.

Overview

Ultra Petroleum Corp. is an independent exploration and production company focused on developing its long-life natural gas reserves in the Green River Basin of Wyoming — the Pinedale and Jonah Fields — and is in the early exploration and development stages in the Appalachian Basin of Pennsylvania. The Company operates in one industry segment, natural gas and oil exploration and development with one geographical segment, the United States.

The Company currently conducts operations exclusively in the United States. Substantially all of its oil and natural gas activities are conducted jointly with others and, accordingly, amounts presented reflect only the Company’s proportionate interest in such activities. Inflation has not had a material impact on the Company’s results of operations and is not expected to have a material impact on the Company’s results of operations in the future.

The Company currently generates substantially all of its revenue, earnings and cash flow from the production and sales of natural gas and oil. An increasing portion of the Company’s revenues is associated with natural gas sales from wells located in the Appalachian Basin in Pennsylvania.

The price of natural gas is a critical factor to the Company’s business and the price of natural gas has historically been volatile. Volatility could be detrimental to the Company’s financial performance. The Company seeks to limit the impact of this volatility on its results by entering into fixed price forward physical delivery contracts and swap agreements for natural gas. During the quarter ended June 30, 2011, the average price realization for the Company’s natural gas was $5.17 per Mcf, including realized gains and losses on commodity derivatives. The Company’s average price realization for natural gas was $4.38 per Mcf, excluding the realized gains and losses on commodity derivatives. (See Note 6).

The Company has consistently delivered meaningful reserve and production growth over the past twelve years and management believes it has the ability to continue growing production by drilling already identified locations on its core properties. Ultra maintains a portfolio of properties that provide long-term growth through development in areas that support sustainable, lower-risk, repeatable, high return drilling projects. The Company delivered 13% production growth on a gas equivalent basis during the quarter ended June 30, 2011 as compared to the same quarter in 2010.

Critical Accounting Policies

The discussion and analysis of the Company’s financial condition and results of operations is based upon consolidated financial statements, which have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”). In addition, application of GAAP requires the use of estimates, judgments and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements as well as the revenues and expenses reported during the period. Changes in these estimates related to judgments and assumptions will occur as a result of future events, and, accordingly, actual results could differ from amounts estimated. Set forth below is a discussion of the critical accounting policies used in the preparation of the Company’s financial statements which the Company believes involve the most complex or subjective decisions or assessments.

Derivative Instruments and Hedging Activities.  Currently, the Company largely relies on derivative instruments (generally, financial swaps) to manage its exposure to commodity price risk. Additionally, and from time to time, the Company enters into fixed price forward natural gas sales in order to mitigate its commodity price exposure on a portion of its natural gas production. These fixed price forward gas sales are considered normal sales in the ordinary course of business and outside the scope of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 815, Derivatives and Hedging (“FASB ASC 815”).

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The Company records the fair value of its commodity derivatives as an asset or liability on the Consolidated Balance Sheets, and records the changes in the fair value of its commodity derivatives in the Consolidated Statements of Income as an unrealized gain or loss on commodity derivatives.

Fair Value Measurements.  The Company follows FASB ASC Topic 820, Fair Value Measurements and Disclosures (“FASB ASC 820”). Under FASB ASC 820, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at measurement date and establishes a three level hierarchy for measuring fair value. The valuation assumptions utilized to measure the fair value of the Company’s commodity derivatives were observable inputs based on market data obtained from independent sources and are considered Level 2 inputs (quoted prices for similar assets, liabilities (adjusted) and market-corroborated inputs).

In consideration of counterparty credit risk, the Company assessed the possibility of whether each counterparty to the derivative would default by failing to make any contractually required payments as scheduled in the derivative instrument in determining the fair value. Additionally, the Company considers that it is of substantial credit quality and has the financial resources and willingness to meet its potential repayment obligations associated with the derivative transactions.

The fair values summarized below were determined in accordance with the requirements of FASB ASC 820 and the Company aligned the categories below with the Level 1, 2, and 3 fair value measurements as defined by FASB ASC 820. The balance of net unrealized gains and losses recognized for the Company’s energy-related derivative instruments at June 30, 2011 is summarized in the following table based on the inputs used to determine fair value:

	Level 1(a)		Level 2(b)		Level 3(c)		Total
	(Amounts in 000’s)
Assets:
Current derivative asset	$	—	$	93,922	$	—	$	93,922
Non-current derivative asset	$	—	$	10,785	$	—	$	10,785
Liabilities:
Non-current derivative liability	$	—	$	1,583	$	—	$	1,583

(a)	Values represent observable unadjusted quoted prices for traded instruments in active markets.
(b)	Values with inputs that are observable directly or indirectly for the instrument, but do not qualify for Level 1.
(c)	Values with a significant amount of inputs that are not observable for the instrument.

Asset Retirement Obligation.  The Company’s asset retirement obligations (“ARO”) consist primarily of estimated costs of dismantlement, removal, site reclamation and similar activities associated with its oil and natural gas properties. FASB ASC Topic 410, Asset Retirement and Environmental Obligations (“FASB ASC 410”) requires that the discounted fair value of a liability for an ARO be recognized in the period in which it is incurred with the associated asset retirement cost capitalized as part of the carrying cost of the oil and natural gas asset. The recognition of an ARO requires that management make numerous estimates, assumptions and judgments regarding such factors as the existence of a legal obligation for an ARO, estimated probabilities, amounts and timing of settlements; the credit-adjusted, risk-free rate to be used; inflation rates, and future advances in technology. In periods subsequent to initial measurement of the ARO, the Company must recognize period-to-period changes in the liability resulting from the passage of time and revisions to either the timing or the amount of the original estimate of undiscounted cash flows. Increases in the ARO liability due to the passage of time impact net income as accretion expense. The related capitalized costs, including revisions thereto, are charged to expense through depletion, depreciation and amortization (“DD&A”).

Share-Based Payment Arrangements.  The Company applies FASB ASC Topic 718, Compensation — Stock Compensation (“FASB ASC 718”), which requires the measurement and recognition of compensation expense for all share-based payment awards made to employees and directors, including employee stock options, based on estimated fair values. Share-based compensation expense recognized for the six months ended June 30, 2011 and 2010 was $6.4 million and $6.1 million, respectively. At June 30, 2011, there was $0.1 million of total unrecognized

16

compensation cost related to non-vested share-based compensation arrangements granted under stock option plans. That cost is expected to be recognized over a weighted average period of 0.17 years. See Note 4 for additional information.

Full Cost Method of Accounting.  The Company uses the full cost method of accounting for oil and gas exploration and development activities as defined by the Securities and Exchange Commission (“SEC”) Release No. 33-8995, Modernization of Oil and Gas Reporting Requirements (“SEC Release No. 33-8995”) and FASB ASC Topic 932, Extractive Activities — Oil and Gas (“FASB ASC 932”). Under the full cost method of accounting, all costs associated with the exploration for and development of oil and gas reserves are capitalized on a country-by-country basis. Such costs include land acquisition costs, geological and geophysical expenses, carrying charges on non-producing properties, costs of drilling both productive and non-productive wells and overhead charges directly related to acquisition, exploration and development activities. Substantially all of the oil and gas activities are conducted jointly with others and, accordingly, the amounts reflect only the Company’s proportionate interest in such activities.

Companies that use the full cost method of accounting for oil and natural gas exploration and development activities are required to perform a ceiling test calculation each quarter. The full cost ceiling test is an impairment test prescribed by SEC Regulation S-X Rule 4-10. The ceiling test is performed quarterly, on a country-by-country basis, utilizing the average of prices in effect on the first day of the month for the preceding twelve month period in accordance with SEC Release No. 33-8995. The ceiling limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved crude oil and natural gas reserves discounted at 10% plus the lower of cost or market value of unproved properties less any associated tax effects. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to earnings. Any such write-down will reduce earnings in the period of occurrence and results in a lower DD&A rate in future periods. A write-down may not be reversed in future periods even though higher oil and natural gas prices may subsequently increase the ceiling. The Company did not have any write-downs related to the full cost ceiling limitation during the six months ended June 30, 2011 or 2010.

The calculation of the ceiling test is based upon estimates of proved reserves. There are numerous uncertainties inherent in estimating quantities of proved reserves, in projecting the future rates of production and in the timing of development activities. The accuracy of any reserve estimate is a function of the quality of available data and of engineering and geological interpretation and judgment. Results of drilling, testing and production subsequent to the date of the estimate may justify revision of such estimate. Accordingly, reserve estimates are often different from the quantities of oil and natural gas that are ultimately recovered.

Capitalized Interest.  Interest is capitalized on the cost of unevaluated gas and oil 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 (See Note 2).

Conversion of barrels of oil to Mcfe of gas.  The Company converts Bbls of oil and other liquid hydrocarbons to Mcfe at a ratio of one Bbl of oil or liquids to six Mcfe. This conversion ratio, which is typically used in the oil and gas industry, represents the approximate energy equivalent of a barrel of oil or other liquids to an Mcf of natural gas. The sales price of one Bbl of oil or liquids has been much higher than the sales price of six Mcf of natural gas over the last several years, so a six to one conversion ratio does not represent the economic equivalency of six Mcf of natural gas to a Bbl of oil or other liquids.

RESULTS OF OPERATIONS

Quarter Ended June 30, 2011 vs. Quarter Ended June 30, 2010

During the quarter ended June 30, 2011, production increased 13% on a gas equivalent basis to 59.1 Bcfe from 52.4 Bcfe for the same quarter in 2010. This increase in production was attributable to the Company’s successful drilling activities during 2010 and in the first six months of 2011. Realized natural gas prices, including realized gains and losses on commodity derivatives, increased 7% to $5.17 per Mcf in the second quarter of 2011 as compared to $4.83 per Mcf for the same quarter of 2010. During the three months ended June 30, 2011, the Company’s average price for natural gas was $4.38 per Mcf, excluding realized gains and losses on commodity

17

derivatives as compared to $4.09 per Mcf for the same period in 2010. The increase in average natural gas prices together with the increase in production contributed to a 23% increase in revenues to $280.6 million as compared to $228.4 million in 2010.

Lease operating expense (“LOE”) decreased to $11.1 million during the second quarter of 2011 compared to $11.5 million during the same period in 2010 primarily due to lower water handling costs as a result of the initiation of the second phase of the liquids gathering system of the Company’s condensate and water gathering facilities in Wyoming. On a unit of production basis, LOE costs decreased to $0.19 per Mcfe at June 30, 2011 compared to $0.22 per Mcfe at June 30, 2010 primarily due to lower water handling costs together with increased production volumes.

During the three months ended June 30, 2011, production taxes were $24.8 million compared to $22.5 million during the same period in 2010, or $0.42 per Mcfe compared to $0.43 per Mcfe. During the three months ended June 30, 2011, the Company’s average price for natural gas was $4.38 per Mcf, excluding realized gains and losses on commodity derivatives, as compared to $4.09 per Mcf for the same period in 2010. Production taxes are calculated based on a percentage of revenue from production in Wyoming after certain deductions and were 8.9% of revenues for the quarter ended June 30, 2011 and 9.8% of revenues for the same period in 2010.

Gathering fees increased to $13.9 million for the three months ended June 30, 2011 compared to $12.5 million during the same period in 2010 largely due to increased production volumes. On a per unit basis, gathering fees remained flat at $0.24 per Mcfe for the three months ended June 30, 2011 and 2010.

To secure pipeline infrastructure providing sufficient capacity to transport a portion of the Company’s natural gas production into relatively higher priced Northeastern markets and to provide for reasonable basis differentials for its natural gas, the Company incurred firm transportation charges totaling $16.3 million for the quarter ended June 30, 2011 as compared to $16.5 million for the same period in 2010 in association with Rockies Express Pipeline (“REX”) transportation charges. On a per unit basis, transportation charges decreased to $0.28 per Mcfe (on total company volumes) for the three months ended June 30, 2011 as compared to $0.32 per Mcfe (on total company volumes) for the same period in 2010 due to the increase in production volumes during the quarter ended June 30, 2011.

DD&A expenses increased to $79.2 million during the three months ended June 30, 2011 from $56.9 million for the same period in 2010, attributable primarily to increased production volumes and a higher depletion rate. On a unit of production basis, DD&A increased to $1.34 per Mcfe for the quarter ended June 30, 2011 from $1.08 per Mcfe for the quarter ended June 30, 2010 as a result of higher development costs.

General and administrative expenses remained relatively flat at $6.0 million for the quarter ended June 30, 2011 compared to $6.1 million for the same period in 2010. On a per unit basis, general and administrative expenses decreased to $0.10 per Mcfe for the quarter ended June 30, 2011 as compared to $0.12 per Mcfe for the quarter ended June 30, 2010 as a result of increased production volumes during the quarter ended June 30, 2011.

Interest expense increased to $15.6 million during the quarter ended June 30, 2011 compared to $11.4 million during the same period in 2010 as a result of increased borrowings outstanding during the period ended June 30, 2011. At June 30, 2011, the Company had $1.7 billion in borrowings outstanding. In addition, the Company capitalized $7.5 million and $5.2 million in interest expense for the quarters ended June 30, 2011 and 2010, respectively, related to unevaluated oil and gas properties and work in process relating to gathering systems that are not currently in service (See Note 2).

During the quarter ended June 30, 2011, the Company recognized $45.1 million of realized gain on commodity derivatives as compared to $37.7 million of realized gain on commodity derivatives during the quarter ended June 30, 2010. The realized gain or loss on commodity derivatives relates to actual amounts received or paid under these derivative contracts.

During the quarter ended June 30, 2011, the Company recognized $2.5 million in unrealized gain on commodity derivatives as compared to $23.1 million in unrealized loss on commodity derivatives during the quarter ended June 30, 2010. The unrealized gain or loss on commodity derivatives represents the change in the fair value of these derivative instruments over the remaining term of the contract.

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During the quarter ended June 30, 2010, the Company recognized litigation expenses of $9.9 million related to the resolution of litigation matters.

The Company recognized income before income taxes of $161.2 million for the quarter ended June 30, 2011 compared with income before income taxes of $95.6 million for the same period in 2010. The increase in earnings is primarily related to the increase in revenues as a result of the increase in production together with increased average natural gas prices and the change in the unrealized gain or loss on commodity derivatives during the quarter ended June 30, 2011 as compared to the same period in 2010.

The income tax provision recognized for the quarter ended June 30, 2011 was $57.7 million compared with $34.1 million for the three months ended June 30, 2010. The increase is primarily related to the increase in revenues as a result of the increase in production together with increased average natural gas prices and the change in the unrealized gain or loss on commodity derivatives during the quarter ended June 30, 2011 as compared to the same period in 2010. The effective tax rate for the quarter ended June 30, 2011 increased as compared to the prior year period primarily due to elevated activity levels in the higher state tax rate jurisdiction of Pennsylvania.

For the three months ended June 30, 2011, the Company recognized net income of $103.5 million or $0.67 per diluted share as compared with net income of $61.5 million or $0.40 per diluted share for the same period in 2010. The increase is primarily related to increased revenues as a result of the increase in production together with increased average natural gas prices and the change in the unrealized gain or loss on commodity derivatives during the quarter ended June 30, 2011 as compared to the same period in 2010.

Six Months Ended June 30, 2011 vs. Six Months Ended June 30, 2010

During the six months ended June 30, 2011, production increased 14% on a gas equivalent basis to 114.9 Bcfe from 100.9 Bcfe for the same period in 2010 attributable to the Company’s successful drilling activities during 2010 and in the first six months of 2011. Realized natural gas prices, including realized gains and losses on commodity derivatives, increased 1% to $5.15 per Mcf in the six months ended June 30, 2011 as compared to $5.09 per Mcf for the same period in 2010. During the six months ended June 30, 2011, the Company’s average price for natural gas was $4.34 per Mcf, excluding realized gains and losses on commodity derivatives as compared to $4.71 per Mcf for the same period in 2010. The increase in production offset in part by the decrease in average natural gas prices, excluding realized gains and losses on commodity derivatives, contributed to a 7% increase in revenues to $537.9 million as compared to $501.5 million in 2010.

LOE increased to $23.5 million during the six months ended June 30, 2011 compared to $21.9 million during the same period in 2010 largely due to increased production. On a unit of production basis, LOE costs decreased to $0.20 per Mcfe at June 30, 2011 compared to $0.22 per Mcfe at June 30, 2010 primarily due to increased production volumes together with lower water handling costs as a result of the initiation of the second phase of the liquids gathering system of the Company’s condensate and water gathering facilities in Wyoming during the period ended June 30, 2011.

During the six months ended June 30, 2011, production taxes were $48.1 million compared to $50.9 million during the same period in 2010, or $0.42 per Mcfe compared to $0.50 per Mcfe. The decrease in per unit taxes was attributable to the decrease in sales revenues as a result of the decrease in average natural gas prices, excluding the effects of commodity derivatives, during the six months ended June 30, 2011 as compared to the same period in 2010. Production taxes are calculated based on a percentage of revenue from production in Wyoming and were 8.9% of revenues for the six months ended June 30, 2011 compared with 10.1% for the same period in 2010.

Gathering fees increased to $26.9 million for the six months ended June 30, 2011 compared to $24.5 million during the same period in 2010 largely due to increased production volumes. On a per unit basis, gathering fees decreased to $0.23 per Mcfe for the six months ended June 30, 2011 as compared to $0.24 per Mcfe during the same period in 2010 as a result of increased production in Pennsylvania, which is subject to lower average gathering fees.

To secure pipeline infrastructure providing sufficient capacity to transport a portion of the Company’s natural gas production into relatively higher priced Northeastern markets and to provide for reasonable basis differentials for its natural gas, the Company incurred firm transportation charges totaling $32.4 million for the six months ended June 30, 2011 and 2010 in association with REX transportation charges. On a per unit basis, transportation charges

19

decreased to $0.28 per Mcfe (on total company volumes) for the six months ended June 30, 2011 as compared to $0.32 per Mcfe (on total company volumes) for the same period in 2010 due to the increase in production volumes during the period ended June 30, 2011.

DD&A expenses increased to $153.0 million during the six months ended June 30, 2011 from $108.1 million for the same period in 2010, attributable primarily to increased production volumes and a higher depletion rate. On a unit of production basis, DD&A increased to $1.33 per Mcfe for the six months ended June 30, 2011 from $1.07 per Mcfe for the six months ended June 30, 2010 as a result of higher development costs.

General and administrative expenses increased to $13.1 million for the six months ended June 30, 2011 compared to $12.5 million for the same period in 2010. The increase in general and administrative expenses is primarily attributable to increased headcount and related compensation. On a per unit basis, general and administrative expenses decreased to $0.11 per Mcfe for the six months ended June 30, 2011 compared with $0.12 per Mcfe for the same period in 2010.

Interest expense increased to $30.2 million during the six months ended June 30, 2011 compared to $23.2 million during the same period in 2010 as a result of increased borrowings outstanding during the period ended June 30, 2011. At June 30, 2011, the Company had $1.7 billion in borrowings outstanding. In addition, the Company capitalized $15.5 million and $7.4 in interest expense for the six months ended June 30, 2011 and 2010, respectively, related to unevaluated oil and gas properties and work in process relating to gathering systems that are not currently in service (See Note 2).

During the six months ended June 30, 2011, the Company recognized $90.1 million of realized gain on commodity derivatives as compared to $37.0 million of realized gain on commodity derivatives during the six months ended June 30, 2010. The realized gain or loss on commodity derivatives relates to actual amounts received or paid under these derivative contracts.

During the six months ended June 30, 2011, the Company recognized $26.9 million in unrealized loss on commodity derivatives as compared to $158.9 million in unrealized gain on commodity derivatives during the six months ended June 30, 2010. The unrealized gain or loss on commodity derivatives represents the change in the fair value of these derivative instruments over the remaining term of the contract.

During the six months ended June 30, 2010, the Company recognized litigation expenses of $9.9 million related to the resolution of litigation matters.

The Company recognized income before income taxes of $273.9 million for the six months ended June 30, 2011 compared with income before income taxes of $414.3 million for the same period in 2010. The decrease in earnings is primarily related to the change in the unrealized gain or loss on commodity derivatives during the six months ended June 30, 2011 as compared to the same period in 2010 offset in part by increased production during the six months ended June 30, 2011.

The income tax provision recognized for the six months ended June 30, 2011 was $101.7 million compared with $150.4 million for the same period in 2010. The decrease is largely a result of the change in unrealized gain or loss on commodity derivatives during the six months ended June 30, 2011 as compared to the same period in 2010 offset in part by the increase in production during the six months ended June 30, 2011 as compared to the same period in 2010. The effective tax rate for the six months ended June 30, 2011 increased as compared to the prior period primarily due to elevated activity levels in the higher state tax rate jurisdiction of Pennsylvania.

For the six months ended June 30, 2011, the Company recognized net income of $172.2 million or $1.11 per diluted share as compared with net income of $263.9 million or $1.71 per diluted share for the same period in 2010. The decrease is primarily attributable to the change in the unrealized gain or loss on commodity derivatives offset in part by increased production during the six months ended June 30, 2011 as compared to the same period in 2010.

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LIQUIDITY AND CAPITAL RESOURCES

During the six month period ended June 30, 2011, the Company relied on cash provided by operations along with borrowings under the senior credit facility to finance its capital expenditures. During this period, the Company participated in 244 gross (127.9 net) wells that were drilled to total depth and cased in Wyoming and Pennsylvania. For the six month period ended June 30, 2011, total capital expenditures were $717.2 million ($695.8 million related to oil and gas exploration and development expenditures and $21.4 million related to gathering system expenditures).

At June 30, 2011, the Company reported a cash position of $6.7 million compared to $8.3 million at June 30, 2010. Working capital deficit at June 30, 2011 was $352.9 million compared to working capital deficit of $135.5 million at June 30, 2010. At June 30, 2011, the Company had $154.0 million in outstanding borrowings and $346.0 million of available borrowing capacity under the credit facility. In addition, the Company had $1.56 billion outstanding under its Senior Notes (See Note 3). Other long-term obligations of $59.4 million at June 30, 2011 was comprised of items payable in more than one year, primarily related to production taxes and asset retirement obligations.

The Company’s available cash, existing credit facility and the cash generated from operations, are projected to be sufficient to meet the Company’s obligations and to fund the budgeted capital investment program for 2011, which is currently projected to be $1.35 billion. Of the $1.35 billion budget, the Company plans to allocate approximately 50% to Wyoming, 40% to Pennsylvania and the remainder to midstream, land and other.

Bank indebtedness:  The Company (through its subsidiary) is a party to a revolving credit facility with a syndicate of banks led by JP Morgan Chase Bank, N.A. which matures in April 2012. Currently, the Company anticipates replacing this facility prior to its maturity in 2012.

This agreement provides an initial loan commitment of $500.0 million and may be increased to a maximum aggregate amount of $750.0 million at the request of the Company. Each bank has the right, but not the obligation, to increase the amount of its commitment as requested by the Company. In the event the existing banks increase their commitment to an amount less than the requested commitment amount, then it would be necessary to add new financial institutions to the credit facility.

Loans under the credit facility are unsecured and bear interest, at the Company’s option, based on (A) a rate per annum equal to the higher of the prime rate or the weighted average fed funds rate on overnight transactions during the preceding business day plus 50 basis points, or (B) a base Eurodollar rate, substantially equal to the LIBOR rate, plus a margin based on a grid of the Company’s consolidated leverage ratio (125 basis points per annum as of June 30, 2011).

The facility has restrictive covenants that include the maintenance of a ratio of consolidated funded debt to EBITDAX (earnings before interest, taxes, DD&A and exploration expense) not to exceed three and one half times; and as long as the Company’s debt rating is below investment grade, the maintenance of an annual ratio of the net present value of the Company’s oil and gas properties to total funded debt of at least 1.75 to 1.00. At June 30, 2011, the Company was in compliance with all of its debt covenants under the credit facility.

Senior Notes:  The Senior Notes rank pari passu with the Company’s bank credit facility. Payment of the Senior Notes is guaranteed by Ultra Petroleum Corp. and UP Energy Corporation. The Senior Notes are pre-payable in whole or in part at any time and are subject to representations, warranties, covenants and events of default customary for a senior note financing. At June 30, 2011, the Company was in compliance with all of its debt covenants under the Master Note Purchase Agreement (See Note 3).

Operating Activities.  During the six months ended June 30, 2011, net cash provided by operating activities was $477.4 million, a 28% increase from $372.2 million for the same period in 2010. The increase in net cash provided by operating activities is largely attributable to increased production and increased revenues including realized gains on commodity derivatives during the six months ended June 30, 2011 as compared to the same period in 2010.

Investing Activities.  During the six months ended June 30, 2011, net cash used in investing activities was $690.7 million as compared to $760.1 million for the same period in 2010. The decrease in net cash used in

21

investing activities is largely associated with the Pennsylvania Marcellus Shale acquisition in February 2010 and offset by increased capital investments associated with the Company’s drilling activities in 2011 as compared to 2010.

Financing Activities.  During the six months ended June 30, 2011, net cash provided by financing activities was $149.2 million as compared to $382.0 million for the same period in 2010. The decrease in net cash provided by financing activities is largely due to decreased borrowings in 2011 as compared to 2010, primarily attributable to the Senior Notes offering during the six months ended June 30, 2010.

OFF BALANCE SHEET ARRANGEMENTS

The Company did not have any off-balance sheet arrangements as of June 30, 2011.

CAUTIONARY STATEMENT PURSUANT TO SAFE HARBOR PROVISION OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

This report contains or incorporates by reference forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical facts included in this document, including without limitation, statements in Management’s Discussion and Analysis of Financial Condition and Results of Operations regarding the Company’s financial position, estimated quantities and net present values of reserves, business strategy, plans and objectives of the Company’s management for future operations, covenant compliance and those statements preceded by, followed by or that otherwise include the words “believe”, “expects”, “anticipates”, “intends”, “estimates”, “projects”, “target”, “goal”, “plans”, “objective”, “should”, or similar expressions or variations on such expressions are forward-looking statements. The Company can give no assurances that the assumptions upon which such forward-looking statements are based will prove to be correct nor can the Company assure adequate funding will be available to execute the Company’s planned future capital program.

Other risks and uncertainties include, but are not limited to, fluctuations in the price the Company receives for oil and gas production, reductions in the quantity of oil and gas sold due to increased industry-wide demand and/or curtailments in production from specific properties due to mechanical, marketing or other problems, operating and capital expenditures that are either significantly higher or lower than anticipated because the actual cost of identified projects varied from original estimates and/or from the number of exploration and development opportunities being greater or fewer than currently anticipated and increased financing costs due to a significant increase in interest rates. See the Company’s annual report on Form 10-K for the year ended December 31, 2010 for additional risks related to the Company’s business.

Item 3 — Quantitative and Qualitative Disclosures About Market Risk

Objectives and Strategy:  The Company’s major market risk exposure is in the pricing applicable to its natural gas and oil production. Realized pricing is currently driven primarily by the prevailing price for the Company’s natural gas production. Historically, prices received for natural gas production have been volatile and unpredictable. Pricing volatility is expected to continue. As a result of its hedging activities, the Company may realize prices that are less than or greater than the spot prices that it would have received otherwise.

The Company relies on various types of derivative instruments to manage its exposure to commodity price risk and to provide a level of certainty in the Company’s forward cash flows supporting the Company’s capital investment program.

From time to time, the Company may use fixed price forward gas sales to manage its commodity price exposure. These fixed price forward gas sales are considered normal sales in the ordinary course of business and outside the scope of FASB ASC 815, Derivatives and Hedging.

The Company’s hedging policy limits the amounts of resources hedged to not more than 50% of its forecast production without Board approval. The Board has approved hedging greater than 50% of the Company’s forecast 2011 production.

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Fair Value of Commodity Derivatives:  FASB ASC 815 requires that all derivatives be recognized on the balance sheet as either an asset or liability and be measured at fair value. Changes in the derivative’s fair value are recognized currently in earnings unless specific hedge accounting criteria are met. The Company does not apply hedge accounting to any of its derivative instruments.

Derivative contracts that do not qualify for hedge accounting treatment are recorded as derivative assets and liabilities at fair value on the balance sheet and the associated unrealized gains and losses are recorded as current expense or income in the Consolidated Statements of Income. Unrealized gains or losses on commodity derivatives represent the non-cash change in the fair value of these derivative instruments and does not impact operating cash flows on the cash flow statement. See Note 7 for the detail of the asset and liability values of the following derivatives.

Commodity Derivative Contracts:  At June 30, 2011, the Company had the following open commodity derivative contracts to manage price risk on a portion of its natural gas production whereby the Company receives the fixed price and pays the variable price. The natural gas reference prices of these commodity derivative contracts are typically referenced to natural gas index prices as published by independent third parties.

	Commodity						Fair Value -
	Reference	Remaining Contract	Volume -		Average		June 30,
Type	Price	Period	MMBTU/Day		Price/MMBTU		2011
							Asset
Swap	NW Rockies	Calendar 2011		170,000	$	5.08	$	26,980
Swap	NYMEX	July — October 2011		230,000	$	4.58	$	5,538
Swap	NYMEX	Calendar 2012		300,000	$	5.03	$	21,644
Swap	NYMEX	April — October 2012		90,000	$	5.00	$	4,668
Swap	Northeast	Calendar 2011		195,000	$	5.81	$	44,294

The following table summarizes the pre-tax realized and unrealized gains and losses the Company recognized related to its natural gas derivative instruments in the Consolidated Statements of Income for the six months ended June 30, 2011 and 2010:

	For the Three Months					For the Six Months
	Ended June 30,					Ended June 30,
Natural Gas Commodity Derivatives:	2011		2010			2011			2010
	(Amounts in 000’s)
Realized gain on commodity derivatives(1)	$	45,080	$	37,654		$	90,120		$	36,985
Unrealized gain (loss) on commodity derivatives(1)		2,526		(23,088	)		(26,879	)		158,932
Total gain on commodity derivatives	$	47,606	$	14,566		$	63,241		$	195,917

(1) Included in gain on commodity derivatives in the Consolidated Statements of Income.

Item 4 — Controls and Procedures

(a)   Evaluation of Disclosure Controls and Procedures

The Company has performed an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the “Exchange Act”). The Company’s disclosure controls and procedures are the controls and other procedures that it has designed to ensure that it records, processes, accumulates and communicates information to the Company’s management, including its Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosures and submissions within the time periods specified in the SEC’s rules and forms. All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those determined to be effective can provide only a reasonable assurance with respect to financial statement preparation and presentation. Based on the evaluation, the Company’s management, including its Chief Executive Officer and Chief Financial Officer, concluded that the Company’s disclosure controls and procedures were effective as of June 30, 2011. There were no

23

changes in the Company’s internal control over financial reporting during the six months ended June 30, 2011 that have materially affected or are reasonably likely to affect, the Company’s internal control over financial reporting.

Part II — Other Information

Item 1.  Legal Proceedings

The Company is currently involved in various routine disputes and allegations incidental to its business operations. While it is not possible to determine the ultimate disposition of these matters, the Company believes that the resolution of all such pending or threatened litigation is not likely to have a material adverse effect on the Company’s financial position, or results of operations.

Item 1A.  Risk Factors

There have been no material changes with respect to the risk factors disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010.

Item 2.  Changes in Securities and Use of Proceeds

On May 17, 2006, the Company announced that its Board of Directors authorized a share repurchase program for up to an aggregate $1 billion of the Company’s outstanding common stock which has been and will be funded by cash on hand and the Company’s senior credit facility.

					Total Number		Maximum
					of Shares		Number (or
					Purchased as		Approximate
					Part of Publicly		Dollar Value)
	Total Number				Announced		that may yet
	of Shares		Average Price		Plans or		be Purchased
	Purchased		Paid per		Programs		Under the Plans
Period	(000’s)		Share		(000’s)		or Programs
April 2011		—		—		—	$	405 million
May 2011		49	$	45.15		49	$	403 million
June 2011		21	$	47.80		21	$	402 million

Item 3.  Defaults Upon Senior Securities

None.

Item 4.  [Removed and Reserved]

Item 5.  Other Information

None.

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Item 6.  Exhibits

(a)   Exhibits

3	.1	Articles of Incorporation of Ultra Petroleum Corp. — (incorporated by reference to Exhibit 3.1 of the Company’s Quarterly Report on Form 10Q for the period ended June 30, 2001.)
3	.2	By-Laws of Ultra Petroleum Corp-(incorporated by reference to Exhibit 3.2 of the Company’s Quarterly Report on Form 10Q for the period ended June 30, 2001.)
3	.3	Articles of Amendment to Articles of Incorporation of Ultra Petroleum Corp. (incorporated by reference to Exhibit 3.3 of the Company’s Report on Form 10-K/A for the period ended December 31, 2005.)
4	.1	Specimen Common Share Certificate — (incorporated by reference to Exhibit 4.1 of the Company’s Quarterly Report on Form 10Q for the period ended June 30, 2001.)
31	.1*	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31	.2*	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32	.1*	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32	.2*	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	.INS**	XBRL Instance Document.
101	.SCH**	XBRL Taxonomy Extension Schema Document.
101	.CAL**	XBRL Taxonomy Calculation Linkbase Document.
101	.LAB**	XBRL Label Linkbase Document.
101	.PRE**	XBRL Presentation Linkbase Document.
101	.DEF**	XBRL Taxonomy Extension Definition.

*	Filed or furnished herewith.
**	The documents formatted in XBRL (Extensible Business Reporting Language) and attached as Exhibit 101 to this report are deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act, are deemed not filed for purposes of section 18 of the Exchange Act, and otherwise, not subject to liability under these sections.

25

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ULTRA PETROLEUM CORP.

By:  /s/  Michael D. Watford

Name:     Michael D. Watford

Title:  Chairman, President and

Chief Executive Officer

Date: August 9, 2011

By:  /s/  Marshall D. Smith

Name:     Marshall D. Smith

Title:  Senior Vice President and

Chief Financial Officer

Date: August 9, 2011

EXHIBIT INDEX

3	.1	Articles of Incorporation of Ultra Petroleum Corp. — (incorporated by reference to Exhibit 3.1 of the Company’s Quarterly Report on Form 10Q for the period ended June 30, 2001.)
3	.2	By-Laws of Ultra Petroleum Corp-(incorporated by reference to Exhibit 3.2 of the Company’s Quarterly Report on Form 10Q for the period ended June 30, 2001.)
3	.3	Articles of Amendment to Articles of Incorporation of Ultra Petroleum Corp. (incorporated by reference to Exhibit 3.3 of the Company’s Report on Form 10-K/A for the period ended December 31, 2005.)
4	.1	Specimen Common Share Certificate — (incorporated by reference to Exhibit 4.1 of the Company’s Quarterly Report on Form 10Q for the period ended June 30, 2001.)
31	.1*	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31	.2*	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32	.1*	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32	.2*	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	.INS**	XBRL Instance Document.
101	.SCH**	XBRL Taxonomy Extension Schema Document.
101	.CAL**	XBRL Taxonomy Calculation Linkbase Document.
101	.LAB**	XBRL Label Linkbase Document.
101	.PRE**	XBRL Presentation Linkbase Document.
101	.DEF**	XBRL Taxonomy Extension Definition.

*	Filed or furnished herewith.
**	The documents formatted in XBRL (Extensible Business Reporting Language) and attached as Exhibit 101 to this report are deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act, are deemed not filed for purposes of section 18 of the Exchange Act, and otherwise, not subject to liability under these sections.

26

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Michael D. Watford, certify that:

        1. I have reviewed this Quarterly Report on Form 10-Q of Ultra Petroleum Corp.;

        2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

        3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

        4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

        (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

        (b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

        (c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report based on such evaluation; and

        (d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

        5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

        (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

        (b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

/s/ Michael D. Watford

Michael D. Watford,

Chairman, President and Chief Executive Officer

(Principal Executive Officer)

Date: August 9, 2011

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Marshall D. Smith, certify that:

        1. I have reviewed this Quarterly Report on Form 10-Q of Ultra Petroleum Corp.;

        2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

        3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

        4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

        (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

        (b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

        (c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report based on such evaluation; and

        (d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

        5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

        (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

        (b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls over financial reporting.

/s/ Marshall D. Smith

Marshall D. Smith,

Senior Vice President and Chief Financial Officer

(Principal Financial Officer)

Date: August 9, 2011

EX-32.1

EXHIBIT 32.1

SECTION 906 CERTIFICATION PURSUANT OF PRINCIPAL EXECUTIVE OFFICER
ULTRA PETROLEUM CORP.

        In connection with the Quarterly Report of Ultra Petroleum Corp. (the “Company”) on Form 10-Q for the fiscal quarter ended June 30, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael D. Watford, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

        (1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

        (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Michael D. Watford

Michael D. Watford,

Chairman, President and Chief Executive Officer

(Principal Executive Officer)

Dated: August 9, 2011

        This certification is being furnished as an exhibit to the Report pursuant to Item 601(b)(32) of Regulation S-K and Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and, accordingly, will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. This certification will not be incorporated by reference into any filing under the Securities Act or the Exchange Act, except to the extent that the Company specifically incorporates it by reference.

EX-32.2

Exhibit 32.2

SECTION 906 CERTIFICATION PURSUANT OF PRINCIPAL FINANCIAL OFFICER
ULTRA PETROLEUM CORP.

        In connection with the Quarterly Report of Ultra Petroleum Corp. (the “Company”) on Form 10-Q for the fiscal quarter ended June 30, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Marshall D. Smith, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

        (1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

        (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Marshall D. Smith

Marshall D. Smith,

Senior Vice President and Chief Financial Officer

(Principal Financial Officer)

Dated: August 9, 2011

        This certification is being furnished as an exhibit to the Report pursuant to Item 601(b)(32) of Regulation S-K and Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and, accordingly, will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. This certification will not be incorporated by reference into any filing under the Securities Act or the Exchange Act, except to the extent that the Company specifically incorporates it by reference.

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Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets, Current [Abstract]
Cash and Cash Equivalents, at Carrying Value	$ 6,698	$ 70,834
Restricted cash	98	98
Oil and gas revenue receivable	93,702	95,142
Oil and Gas Joint Interest Billing Receivables, Current	62,337	48,561
Derivative Assets, Current	93,922	133,991
Inventory, Net	2,883	2,760
Prepaid drilling costs and other current assets	7,787	9,663
Assets, Current	267,427	361,049
Oil And Gas Properties Net Using Full Cost Method Of Accounting [Abstract]
Proved	3,106,966	2,589,423
Unproved properties not being amortized	524,307	486,247
Property, Plant and Equipment, Net	168,376	149,104
Derivative Assets, Noncurrent	10,785	2,066
Other Assets, Noncurrent	7,257	7,726
Assets	4,085,118	3,595,615
Liabilities, Current [Abstract]
Accounts payable and accrued liabilities	236,582	210,311
Current portion of long term debt	154,000	0
Production taxes payable	61,758	53,382
Interest Payable	29,806	26,878
Taxes Payable, Current	26,980	42,685
Derivative Liabilities, Current	0	718
Capital cost accrual	111,200	84,042
Liabilities, Current	620,326	418,016
Long-term Debt, Excluding Current Maturities	1,560,000	1,560,000
Deferred Tax Liabilities, Noncurrent	526,992	420,711
Derivative Liabilities, Noncurrent	1,583	5,337
Other Liabilities, Noncurrent	59,369	52,575
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Value, Issued	452,356	426,779
Treasury Stock, Value	(379)
Retained Earnings (Accumulated Deficit)	864,871	712,197
Stockholders' Equity Attributable to Parent	1,316,848	1,138,976
Liabilities and Stockholders' Equity	$ 4,085,118	$ 3,595,615

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Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Balance Sheets (Parenthetical)
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized	unlimited	unlimited
Common Stock, Shares, Issued	152,922,524	152,567,813
Common Stock, Shares, Outstanding	152,922,524	152,567,813

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Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Significant Accounting Policies Details [Abstract]
Discount Rate Future Net Revenues			10.00%
Inventory, Net	$ 2,883		$ 2,883		$ 2,760
Earnings Per Share Reconciliation [Abstract]
Net Income (Loss)	$ 103,505	$ 61,493	$ 172,226	$ 263,869
Weighted Average Number of Shares Outstanding, Basic	152,899	152,300	152,749	152,187
Incremental Common Shares Attributable to Share-based Payment Arrangements	1,478	2,010	1,749	2,081
Weighted Average Number of Shares Outstanding, Diluted	154,377	154,310	154,498	154,268
Earnings Per Share, Basic	$ 0.68	$ 0.40	$ 1.13	$ 1.73
Earnings Per Share, Diluted	$ 0.67	$ 0.40	$ 1.11	$ 1.71
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	935	1,002	935	1,002

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Document and Entity Information (USD $)	6 Months Ended
	Jun. 30, 2011	Aug. 01, 2011	Jun. 30, 2010
Document and Entity Information
Entity Registrant Name	Ultra Petroleum Corp.
Entity Central Index Key	0001022646
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 6,747,137,694
Entity Common Stock, Shares Outstanding		152,923,374
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2

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Share Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Number Of Options [Member]	Dec. 31, 2010 Number Of Options [Member]	Jun. 30, 2011 Weighted Average Exercise Price [Member]	Dec. 31, 2010 Weighted Average Exercise Price [Member]	Dec. 31, 2009 Weighted Average Exercise Price [Member]
Valuation And Expense Information [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 5,007,000	$ 5,809,000	$ 10,131,000	$ 10,494,000
Amounts capitalized in fixed costs	1,683,000	2,453,000	3,685,000	4,357,000
Share-based Compensation	3,324,000	3,356,000	6,446,000	6,137,000
Amount of related income tax benefit recognized in income	1,193,000	1,191,000	2,314,000	2,179,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options					2,230	3,504
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit							$ 11.68	$ 3.91	$ 1.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit							$ 98.87	$ 98.87	$ 98.87
Forfeited					(2)	(68)
Exercise Price, Lower Range Limit Forfeited							$ 51.60	$ 51.60
Exercise Price, Upper Range Limit Forfeited							$ 75.18	$ 76.01
Exercised					(645)	(1,206)
Exercise Price, Lower Range Limit Exercised							$ 3.91	$ 1.49
Exercise Price, Upper Range Limit Exercised							$ 33.57	$ 45.95
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options					1,583	2,230
Long Term Incentive Program Period			5,000,000	3,800,000
Long Term Incentive Program Total 2009 Program			23,500,000
Long Term Incentive Program Total 2010 Program			11,400,000
Long Term Incentive Program Total 2008 Program			4,300,000
Long Term Incentive Program Total 2011 Program			$ 11,000,000

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Derivative Financial Instruments

6 Months Ended

Jun. 30, 2011

Derivative Financial Instruments [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

6.  DERIVATIVE FINANCIAL INSTRUMENTS:

Objectives and Strategy: The Company's major market risk exposure is in the pricing applicable to its natural gas and oil production. Realized pricing is currently driven primarily by the prevailing price for the Company's natural gas production. Historically, prices received for natural gas production have been volatile and unpredictable. Pricing volatility is expected to continue. As a result of its hedging activities, the Company may realize prices that are less than or greater than the spot prices that it would have received otherwise.

The Company relies on various types of derivative instruments to manage its exposure to commodity price risk and to provide a level of certainty in the Company's forward cash flows supporting the Company's capital investment program.

The Company's hedging policy limits the amounts of resources hedged to not more than 50% of its forecast production without Board approval. The Board has approved hedging greater than 50% of the Company's forecast 2011 production.

Fair Value of Commodity Derivatives:FASB ASC 815 requires that all derivatives be recognized on the balance sheet as either an asset or liability and be measured at fair value. Changes in the derivative's fair value are recognized currently in earnings unless specific hedge accounting criteria are met. The Company does not apply hedge accounting to any of its derivative instruments.

Derivative contracts that do not qualify for hedge accounting treatment are recorded as derivative assets and liabilities at fair value on the balance sheet and the associated unrealized gains and losses are recorded as current income or expense in the income statement. Unrealized gains or losses on commodity derivatives represent the non-cash change in the fair value of these derivative instruments and do not impact operating cash flows on the cash flow statement. See Note 7 for the detail of the asset and liability values of the following derivatives.

Commodity Derivative Contracts:At June 30, 2011, the Company had the following open commodity derivative contracts to manage price risk on a portion of its natural gas production whereby the Company receives the fixed price and pays the variable price. The natural gas reference prices of these commodity derivative contracts are typically referenced to natural gas index prices as published by independent third parties.

Type	Commodity Reference Price	Remaining Contract Period	Volume - MMBTU/Day	Average Price/MMBTU		Fair Value - June 30, 2011
						Asset
Swap	NW Rockies	Calendar 2011	170,000	$5.08	$	26,980
Swap	NYMEX	July - October 2011	230,000	$4.58	$	5,538
Swap	NYMEX	Calendar 2012	300,000	$5.03	$	21,644
Swap	NYMEX	April - October 2012	90,000	$5.00	$	4,668
Swap	Northeast	Calendar 2011	195,000	$5.81	$	44,294

The following table summarizes the pre-tax realized and unrealized gains and losses the Company recognized related to its natural gas derivative instruments in the Consolidated Statements of Income for the six monthsended June 30, 2011 and 2010:

		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
Natural Gas Commodity Derivatives:		2011		2010		2011		2010
Realized gain on commodity derivatives (1)	$	45,080	$	37,654	$	90,120	$	36,985
Unrealized gain (loss) on commodity derivatives (1)		2,526		(23,088)		(26,879)		158,932
Total gain on commodity derivatives	$	47,606	$	14,566	$	63,241	$	195,917
(1) Included in gain on commodity derivatives in the Consolidated Statements of Income.

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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Statement Income Taxes Details [Abstract]
Income Tax Expense (Benefit)	$ 57,709	$ 34,145	$ 101,679	$ 150,417
Effective Income Tax Rate, Continuing Operations	35.80%	35.70%	37.10%	36.30%

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Long Term Liabilities (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Notes Payable to Bank	$ 154,000,000	$ 0
Other Notes Payable	1,560,000,000	1,560,000,000
Other Liabilities, Noncurrent	59,369,000	52,575,000
Total Long Term Liabilities	1,619,369,000	1,612,575,000
Senior Credit Facility Details [Abstract]
Revolving Bank Loan Comitment Value	500,000,000
Max Revolving Bank Loan Comitment Value	750,000,000
Debt Instrument Interest Rate Terms Prime	0.50%
Debt Instrument Interest Rate Terms Libor	1.25%
Notes Payable to Bank	154,000,000	0
Debt Instrument, Unused Borrowing Capacity, Amount	$ 346,000,000
Line of Credit Facility, Covenant Terms	The facility has restrictive covenants that include the maintenance of a ratio of consolidated funded debt to EBITDAX (earnings before interest, taxes, DD&A and exploration expense) not to exceed three and one half times; and as long as the Company’s debt rating is below investment grade, the maintenance of an annual ratio of the net present value of the Company’s oil and gas properties to total funded debt of at least 1.75 to 1.00.

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Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2011

Significant Accounting Policies Tables [Abstract]

Schedule Of Earnings Per Share

		Three Months Ended				Six Months Ended
		June 30,		June 30,		June 30,		June 30,
		2011		2010		2011		2010
		(Share amounts in 000's)
Net income	$	103,505	$	61,493	$	172,226	$	263,869
Weighted average common shares outstanding - basic		152,899		152,300		152,749		152,187
Effect of dilutive instruments		1,478		2,010		1,749		2,081
Weighted average common shares outstanding - fully diluted		154,377		154,310		154,498		154,268
Net income per common share - basic	$	0.68	$	0.40	$	1.13	$	1.73
Net income per common share - fully diluted	$	0.67	$	0.40	$	1.11	$	1.71
Number of shares not included in dilutive earnings per share that would have been anti-dilutive because the exercise price was greater than the average market price of the common
shares		935		1,002		935		1,002

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Oil and Gas Properties

6 Months Ended

Jun. 30, 2011

Oil and Gas Properties [Abstract]

Oil and Gas Exploration and Production Industries Disclosures [Text Block]

2. OIL AND GAS PROPERTIES:
		June 30,		December 31,
		2011		2010
Developed Properties:
Acquisition, equipment, exploration, drilling and environmental costs	$	5,241,709	$	4,575,222
Less: Accumulated depletion, depreciation and amortization		(2,134,743)		(1,985,799)
		3,106,966		2,589,423
Unproven Properties:
Acquisition and exploration costs not being amortized(1)		524,307		486,247
Net capitalized costs - oil and gas properties	$	3,631,273	$	3,075,670

(1)For the six months ended June 30, 2011 and 2010,total interest on outstanding debt was $45.7 million and $30.5 million, respectively, of which, $15.5 million and $7.4 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.

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Legal Proceedings

6 Months Ended

Jun. 30, 2011

Disclosure Legal Proceedings [Abstract]

Commitments and Contingencies, Policy [Text Block]

8.  LEGAL PROCEEDINGS:

The Company is currently involved in various routine disputes and allegations incidental to its business operations. While it is not possible to determine the ultimate disposition of these matters, the Company believes that the resolution of all such pending or threatened litigation is not likely to have a material adverse effect on the Company's financial position or results of operations.

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Long Term Liabilities (Tables)

6 Months Ended

Jun. 30, 2011

Long Term Liabilities Tables [Abstract]

Long Term Liabilities

3. DEBT AND OTHER LONG-TERM OBLIGATIONS:
			June 30,		December 31,
			2011		2010
	Short-term debt:
	Bank indebtedness	$	154,000	$	-
	Long-term debt:
	Senior Notes		1,560,000		1,560,000
	Other long-term obligations		59,369		52,575
	Total long-term obligations	$	1,619,369	$	1,612,575

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Subsequent Events

6 Months Ended

Jun. 30, 2011

Subsequent Events [Abstract]

Schedule of Subsequent Events [Text Block]

9.  SUBSEQUENT EVENTS:

FASB ASC Topic 855, Subsequent Events (“FASB ASC 855”), sets forth principles and requirements to be applied to the accounting for and disclosure of subsequent events. FASB ASC 855 sets forth the period after the balance sheet date during which management shall evaluate events or transactions that may occur for potential recognition or disclosure in the financial statements, the circumstances under which events or transactions occurring after the balance sheet date shall be recognized in the financial statements and the required disclosures about events or transactions that occurred after the balance sheet date. The Company has evaluated the period subsequent to June 30, 2011 for events that did not exist at the balance sheet date but arose after that date and determined that no subsequent eventsarosethat should be disclosed in order to keep the financial statements from being misleading.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2011

Fair Value Measurements [Abstract]

Fair Value Disclosures [Text Block]

7.  FAIR VALUE MEASUREMENTS:

As required by FASB ASC 820, the Company defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and establishes a three level hierarchy for measuring fair value. Fair value measurements are classified and disclosed in one of the following categories:

Level 1:       Quoted prices (unadjusted) in active markets for identical assets and liabilities that the Company has the ability to access at the measurement date.

Level 2:       Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable for the asset or liability, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived from observable market data by correlation or other means. Instruments categorized in Level 2 include non-exchange traded derivatives such as over-the-counter forwards and swaps.

Level 3:       Unobservable inputs for the asset or liability, including situations where there is little, if any, market activity for the asset or liability.

The valuation assumptions utilized to measure the fair value of the Company's commodity derivatives were observable inputs based on market data obtained from independent sources and are considered Level 2 inputs (quoted prices for similar assets, liabilities (adjusted) and market-corroborated inputs).

The following table presents for each hierarchy level the Company's assets and liabilities, including both current and non-current portions, measured at fair value on a recurring basis, as of June 30, 2011. The Company has no derivative instruments which qualify for cash flow hedge accounting.

		Level 1		Level 2		Level 3		Total
Assets:
Current derivative asset	$	-	$	93,922	$	-	$	93,922
Non-current derivative asset	$	-	$	10,785	$	-	$	10,785
Liabilities:
Non-current derivative liability	$	-	$	1,583	$	-	$	1,583

In consideration of counterparty credit risk, the Company assessed the possibility of whether each counterparty to the derivative would default by failing to make any contractually required payments as scheduled in the derivative instrument in determining the fair value. Additionally, the Company considers that it is of substantial credit quality and has the financial resources and willingness to meet its potential repayment obligations associated with the derivative transactions.

Fair Value of Financial Instruments

The estimated fair value of financial instruments is the estimated amount at which the instrument could be exchanged currently between willing parties. The carrying amounts reported in the consolidated balance sheet for cash and cash equivalents, accounts receivable, accounts payable and current portion of long-term debt approximate fair value due to the immediate or short-term maturity of these financial instruments. The Company uses available market data and valuation methodologies to estimate the fair value of debt. This disclosure is presented in accordance with FASB ASC Topic 825, Financial Instruments, and does not impact the Company's financial position, results of operations or cash flows.

		June 30, 2011				December 31, 2010
		Carrying		Estimated		Carrying		Estimated
		Amount		Fair Value		Amount		Fair Value
Long-Term Debt:
5.45% Notes due 2015, issued 2008	$	100,000	$	112,501	$	100,000	$	108,572
7.31% Notes due 2016, issued 2009		62,000		75,205		62,000		72,153
4.98% Notes due 2017, issued 2010		116,000		127,011		116,000		119,385
5.92% Notes due 2018, issued 2008		200,000		227,391		200,000		212,660
7.77% Notes due 2019, issued 2009		173,000		216,729		173,000		203,051
5.50% Notes due 2020, issued 2010		207,000		224,180		207,000		206,233
4.51% Notes due 2020, issued 2010		315,000		313,221		315,000		284,207
5.60% Notes due 2022, issued 2010		87,000		92,417		87,000		84,818
4.66% Notes due 2022, issued 2010		35,000		34,140		35,000		30,989
5.85% Notes due 2025, issued 2010		90,000		96,180		90,000		87,211
4.91% Notes due 2025, issued 2010		175,000		169,343		175,000		152,064
	$	1,560,000	$	1,688,318	$	1,560,000	$	1,561,343

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Description of the Business

6 Months Ended

Jun. 30, 2011

Description Of Business [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

DESCRIPTION OF THE BUSINESS:

Ultra Petroleum Corp. (the “Company”) is an independent oil and gas company engaged in the development, production, operation, exploration and acquisition of oil and natural gas properties. The Company is incorporated under the laws of the Yukon Territory, Canada. The Company's principal business activities are conducted in the Green River Basin of Southwest Wyoming and in the north-central Pennsylvania area of the Appalachian Basin.

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Long Term Liabilities

6 Months Ended

Jun. 30, 2011

Long Term Liabilities [Abstract]

Long-term Debt [Text Block]

3. DEBT AND OTHER LONG-TERM OBLIGATIONS:
			June 30,		December 31,
			2011		2010
	Short-term debt:
	Bank indebtedness	$	154,000	$	-
	Long-term debt:
	Senior Notes		1,560,000		1,560,000
	Other long-term obligations		59,369		52,575
	Total long-term obligations	$	1,619,369	$	1,612,575

Bank indebtedness:  The Company (through its subsidiary) is a party to a revolving credit facility with a syndicate of banks led by JP Morgan Chase Bank, N.A. which matures in April 2012. Currently, the Company anticipates replacing this facility prior to its maturity in 2012.

This agreement provides an initial loan commitment of $500.0 million and may be increased to a maximum aggregate amount of $750.0 million at the request of the Company. Each bank has the right, but not the obligation, to increase the amount of its commitment as requested by the Company. In the event the existing banks increase their commitment to an amount less than the requested commitment amount, then it would be necessary to add new financial institutions to the credit facility.

Loans under the credit facility are unsecured and bear interest, at the Company's option, based on (A) a rate per annum equal to the higher of the prime rate or the weighted average fed funds rate on overnight transactions during the preceding business day plus 50 basis points, or (B) a base Eurodollar rate, substantially equal to the LIBOR rate, plus a margin based on a grid of the Company's consolidated leverage ratio (125 basis points per annum as of June 30,2011).

At June 30, 2011, the Company had $154.0 million in outstanding borrowings and $346.0 million of available borrowing capacity under the credit facility.

The facility has restrictive covenants that include the maintenance of a ratio of consolidated funded debt to EBITDAX (earnings before interest, taxes, DD&A and exploration expense) not to exceed three and one half times; and as long as the Company's debt rating is below investment grade, the maintenance of an annual ratio of the net present value of the Company's oil and gas properties to total funded debt of at least 1.75 to 1.00. At June 30, 2011, the Company was in compliance with all of its debt covenants under the credit facility.

Senior Notes:At June 30, 2011, the Company had $1.56 billion in outstanding Senior Notes. The Senior Notes rank pari passu with the Company's bank credit facility. Payment of the Senior Notes is guaranteed by Ultra Petroleum Corp. and UP Energy Corporation. The Senior Notes are pre-payable in whole or in part at any time and are subject to representations, warranties, covenants and events of default customary for a senior note financing. At June 30, 2011, the Company was in compliance with all of its debt covenants under the Master Note Purchase Agreement.

Other long-term obligations:  These costs primarily relate to the long-term portion of production taxes payable and asset retirement obligations.

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Share Based Compensation

6 Months Ended

Jun. 30, 2011

Stock Based Compensation [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

4. SHARE BASED COMPENSATION:
Valuation and Expense Information
			Three Months				Six Months
			Ended June 30,				Ended June 30,
			2011		2010		2011		2010
	Total cost of share-based payment plans	$	5,007	$	5,809	$	10,131	$	10,494
	Amounts capitalized in fixed assets	$	1,683	$	2,453	$	3,685	$	4,357
	Amounts charged against income, before
	income tax benefit	$	3,324	$	3,356	$	6,446	$	6,137
	Amount of related income tax benefit recognized
	in income	$	1,193	$	1,191	$	2,314	$	2,179

Changes in Stock Options and Stock Options Outstanding

The following table summarizes the changes in stock options for the six months ended June 30, 2011 and the year ended December 31, 2010:

		Weighted
	Number of	Average
	Options	Exercise Price
	(000's)	(US$)
Balance, December 31, 2009	3,504	$	1.49	to	$	98.87
Forfeited	(68)	$	51.60	to	$	76.01
Exercised	(1,206)	$	1.49	to	$	45.95
Balance, December 31, 2010	2,230	$	3.91	to	$	98.87
Forfeited	(2)	$	51.60	to	$	75.18
Exercised	(645)	$	3.91	to	$	33.57
Balance, June 30, 2011	1,583	$	11.68	to	$	98.87

PERFORMANCE SHARE PLANS:

Long Term Incentive Plans.The Company offers a Long Term Incentive Plan (“LTIP”) in order to further align the interests of key employees with shareholders and to give key employees the opportunity to share in the long-term performance of the Company when specific corporate financial and operational goals are achieved. Each LTIP covers a performance period of three years. In 2009, 2010 and 2011, the Compensation Committee (the “Committee”) approved an award consisting of performance-based restricted stock units to be awarded to each participant.

For each LTIP award, the Committee establishes performance measures at the beginning of each performance period. Under each LTIP, the Committee establishes a percentage of base salary for each participant which is multiplied by the participant's base salary to derive a Long Term Incentive Value as a “target” value which corresponds to the number of shares of the Company's common stock the participant is eligible to receive if the target level for all performance measures is met. In addition, each participant is assigned threshold and maximum award levels in the event that actual performance is below or above target levels. For the 2009, 2010 and 2011 LTIP awards, the Committee established the following performance measures: return on equity, reserve replacement ratio, and production growth.

For the six months ended June 30,2011, the Company recognized $5.0 million in pre-tax compensation expense related to the 2009, 2010and 2011LTIP awards of restricted stock units as compared to $3.8 million during the six months ended June 30, 2010 related to the 2008, 2009 and 2010 LTIP awards of restricted stock units. The amounts recognized during the six months ended June 30, 2011 assumes that maximum performance objectives are attained. If the Company ultimately attains these performance objectives, the associated total compensation, estimated at June 30, 2011, for each of the three year performance periods is expected to be approximately $23.5 million, $11.4 million, and $11.0 million related to the 2009, 2010 and 2011 LTIP awards of restricted stock units, respectively. The 2008 LTIP award of restricted stock units was paid in shares of the Company's stock to employees during the first quarter of 2011 and totaled $4.3 million (41,443 net shares).

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Derivative Financial Instruments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Natural Gas Commodity Derivatives [Abstract]
Realized (loss) gain on commodity derivatives	$ 45,080,000	$ 37,654,000	$ 90,120,000	$ 36,985,000
Unrealized Gain (Loss) on Derivatives	2,526,000	(23,088,000)	(26,879,000)	158,932,000
Gain loss on commodity derivatives	47,606,000	14,566,000	63,241,000	195,917,000
Swap [Member] | N W Rockies [Member] | Calendar 2011 [Member]
Schedule Of Derivative Instruments [Line Items]
Derivative, Underlying Basis			170,000
Derivative, Swap Type, Average Fixed Price	5.08		5.08
Derivative Asset, Fair Value	26,980,000		26,980,000
Swap [Member] | Northeast [Member] | Calendar 2011 [Member]
Schedule Of Derivative Instruments [Line Items]
Derivative, Underlying Basis			195,000
Derivative, Swap Type, Average Fixed Price	5.81		5.81
Derivative Asset, Fair Value	44,294,000		44,294,000
Swap [Member] | Nymex [Member] | Calendar 2012 [Member]
Schedule Of Derivative Instruments [Line Items]
Derivative, Underlying Basis			300,000
Derivative, Swap Type, Average Fixed Price	5.03		5.03
Derivative Asset, Fair Value	21,644,000		21,644,000
Swap [Member] | Nymex [Member] | Summer 2011 [Member]
Schedule Of Derivative Instruments [Line Items]
Derivative, Underlying Basis			230,000
Derivative, Swap Type, Average Fixed Price	4.58		4.58
Derivative Asset, Fair Value	5,538,000		5,538,000
Swap [Member] | Nymex [Member] | Summer 2012 [Member]
Schedule Of Derivative Instruments [Line Items]
Derivative, Underlying Basis			90,000
Derivative, Swap Type, Average Fixed Price	5.00		5.00
Derivative Asset, Fair Value	$ 4,668,000		$ 4,668,000

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Oil and Gas Properties (Tables)

6 Months Ended

Jun. 30, 2011

Oil And Gas Properties Tables [Abstract]

Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Text Block]

2. OIL AND GAS PROPERTIES:
		June 30,		December 31,
		2011		2010
Developed Properties:
Acquisition, equipment, exploration, drilling and environmental costs	$	5,241,709	$	4,575,222
Less: Accumulated depletion, depreciation and amortization		(2,134,743)		(1,985,799)
		3,106,966		2,589,423
Unproven Properties:
Acquisition and exploration costs not being amortized(1)		524,307		486,247
Net capitalized costs - oil and gas properties	$	3,631,273	$	3,075,670

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Income Taxes

6 Months Ended

Jun. 30, 2011

Income Taxes [Abstract]

Income Tax Disclosure [Text Block]

5. INCOME TAXES:

During the quarter ended June 30, 2011, the Company recorded an income tax provision of $57.7 million, or 35.8%of income before income tax provision. This compares to an income tax provision of $34.1 million, or 35.7%of income before income tax provision for the quarter ended June 30, 2010. The effective tax rate increased over the comparable prior period primarily due to elevated activity levels in the higher state tax jurisdiction of Pennsylvania which increased the overall effective tax rate to 35.9%.

During the six months ended June 30, 2011, the Company recorded an income tax provision of $101.7 million, or 37.1%of income before income tax provision. This compares to an income tax provision of $150.4 million, or 36.3%of income before income tax provision for the six months ended June 30, 2010. The effective tax rate increased over the comparable prior period primarily due to elevated activity levels in the higher state tax jurisdiction of Pennsylvania as the higher effective tax rate is now being applied to the Company's prior temporary differences which increased the overall effective tax rate to 35.9%.

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Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2011

Derivative Financial Instruments Tables [Abstract]

Schedule of Derivative Instruments [Text Block]

Type	Commodity Reference Price	Remaining Contract Period	Volume - MMBTU/Day	Average Price/MMBTU		Fair Value - June 30, 2011
						Asset
Swap	NW Rockies	Calendar 2011	170,000	$5.08	$	26,980
Swap	NYMEX	July - October 2011	230,000	$4.58	$	5,538
Swap	NYMEX	Calendar 2012	300,000	$5.03	$	21,644
Swap	NYMEX	April - October 2012	90,000	$5.00	$	4,668
Swap	Northeast	Calendar 2011	195,000	$5.81	$	44,294

Gain or loss on derivative instruments

The following table summarizes the pre-tax realized and unrealized gains and losses the Company recognized related to its natural gas derivative instruments in the Consolidated Statements of Income for the six monthsended June 30, 2011 and 2010:

		For the Three Months				For the Six Months
		Ended June 30,				Ended June 30,
Natural Gas Commodity Derivatives:		2011		2010		2011		2010
Realized gain on commodity derivatives (1)	$	45,080	$	37,654	$	90,120	$	36,985
Unrealized gain (loss) on commodity derivatives (1)		2,526		(23,088)		(26,879)		158,932
Total gain on commodity derivatives	$	47,606	$	14,566	$	63,241	$	195,917
(1) Included in gain on commodity derivatives in the Consolidated Statements of Income.

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Fair Value Measurments (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Derivative Assets [Abstract]
Derivative Assets, Current	$ 93,922	$ 133,991
Derivative Assets, Noncurrent	10,785	2,066
Derivative Liabilities [Abstract]
Derivative Liabilities, Current	0	718
Derivative Liabilities, Noncurrent	1,583	5,337
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	1,560,000	1,560,000
Fair Value, Inputs, Level 2 [Member]
Derivative Assets [Abstract]
Derivative Assets, Current	93,922
Derivative Assets, Noncurrent	10,785
Derivative Liabilities [Abstract]
Derivative Liabilities, Current	0
Derivative Liabilities, Noncurrent	1,583
Notes Due 2015 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	100,000	100,000
Notes Payable, Fair Value Disclosure	112,501	108,572
Notes Due 2018 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	200,000	200,000
Notes Payable, Fair Value Disclosure	227,391	212,660
Notes Due 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	62,000	62,000
Notes Payable, Fair Value Disclosure	75,205	72,153
Notes Due 2019 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	173,000	173,000
Notes Payable, Fair Value Disclosure	216,729	203,051
Notes Due 2017 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	116,000	116,000
Notes Payable, Fair Value Disclosure	127,011	119,385
Notes Due January 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	207,000	207,000
Notes Payable, Fair Value Disclosure	224,180	206,233
Notes Due January 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	87,000	87,000
Notes Payable, Fair Value Disclosure	92,417	84,818
Notes Due January 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	90,000	90,000
Notes Payable, Fair Value Disclosure	96,180	87,211
Notes Due October 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	315,000	315,000
Notes Payable, Fair Value Disclosure	313,221	284,207
Notes Due October 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	35,000	35,000
Notes Payable, Fair Value Disclosure	34,140	30,989
Notes Due October 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Excluding Current Maturities	175,000	175,000
Notes Payable, Fair Value Disclosure	$ 169,343	$ 152,064

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Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss)	$ 172,226	$ 263,869
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depletion of Oil and Gas Properties	152,978	108,120
Deferred Income Tax Expense (Benefit)	97,128	147,916
Unrealized Gain (Loss) on Derivatives	26,879	(158,932)
Excess Tax Benefit from Share-based Compensation, Operating Activities	(6,552)	(16,420)
Share-based Compensation	6,446	6,137
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Other	521	271
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Restricted Cash for Operating Activities	0	(82)
Increase (Decrease) in Accounts Receivable	(12,336)	(23,763)
Increase (Decrease) in Prepaid, Deferred Expense and Other Assets	(1,571)	(3,911)
Increase (Decrease) in Other Operating Assets	7	2,905
Increase (Decrease) in Accounts Payable and Accrued Liabilities	38,129	37,891
Other long-term obligations	327	8,181
Increase (Decrease) in Accrued Income Taxes Payable	3,198	0
Net Cash Provided by (Used in) Operating Activities	477,380	372,182
Net Cash Provided by (Used in) Investing Activities [Abstract]
Acquisition Costs	0	(332,970)
Oil and gas property expenditures	(695,810)	(539,783)
Gathering system expenditures	(21,417)	(32,979)
Restricted Cash Non Current	0	28,257
Change in capital cost accrual	27,158	48,324
Proceeds from Sale of Productive Assets	0	68,420
Inventory	(123)	1,006
Payments to Acquire Productive Assets	(489)	(342)
Net Cash Provided by (Used in) Investing Activities	(690,681)	(760,067)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from Issuance of Long-term Debt	504,000	583,000
Repayments of Long-term Debt	(350,000)	(697,000)
Proceeds from issuance of Senior Notes	0	500,000
Payments of Financing Costs	0	(2,265)
Payments for Repurchase of Equity	(20,629)	(23,707)
Excess Tax Benefit from Share-based Compensation, Financing Activities	6,552	16,420
Proceeds from Stock Options Exercised	9,242	5,512
Net Cash Provided by (Used in) Financing Activities	149,165	381,960
Cash and Cash Equivalents, Period Increase (Decrease)	(64,136)	(5,925)
Cash and Cash Equivalents, at Carrying Value	70,834	14,254
Cash and Cash Equivalents, at Carrying Value	$ 6,698	$ 8,329

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements Tables [Abstract]

Fair Value, Measurement Inputs, Disclosure [Text Block]

		Level 1		Level 2		Level 3		Total
Assets:
Current derivative asset	$	-	$	93,922	$	-	$	93,922
Non-current derivative asset	$	-	$	10,785	$	-	$	10,785
Liabilities:
Non-current derivative liability	$	-	$	1,583	$	-	$	1,583

Schedule of Fair Value of Financial Instruments

		June 30, 2011				December 31, 2010
		Carrying		Estimated		Carrying		Estimated
		Amount		Fair Value		Amount		Fair Value
Long-Term Debt:
5.45% Notes due 2015, issued 2008	$	100,000	$	112,501	$	100,000	$	108,572
7.31% Notes due 2016, issued 2009		62,000		75,205		62,000		72,153
4.98% Notes due 2017, issued 2010		116,000		127,011		116,000		119,385
5.92% Notes due 2018, issued 2008		200,000		227,391		200,000		212,660
7.77% Notes due 2019, issued 2009		173,000		216,729		173,000		203,051
5.50% Notes due 2020, issued 2010		207,000		224,180		207,000		206,233
4.51% Notes due 2020, issued 2010		315,000		313,221		315,000		284,207
5.60% Notes due 2022, issued 2010		87,000		92,417		87,000		84,818
4.66% Notes due 2022, issued 2010		35,000		34,140		35,000		30,989
5.85% Notes due 2025, issued 2010		90,000		96,180		90,000		87,211
4.91% Notes due 2025, issued 2010		175,000		169,343		175,000		152,064
	$	1,560,000	$	1,688,318	$	1,560,000	$	1,561,343

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Oil and Gas Properties (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Developed Properties [Abstract]
Capitalized Costs, Proved Properties	$ 5,241,709,000		$ 4,575,222,000
Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance for Relating to Oil and Gas Producing Activities	(2,134,743,000)		(1,985,799,000)
Proved	3,106,966,000		2,589,423,000
Capitalized Costs of Unproved Properties Excluded from Amortization [Abstract]
Oil Gas Properties Using Full Cost Method Accounting Unproved	524,307,000		486,247,000
Capitalized Costs, Oil and Gas Producing Activities, Net	3,631,273,000		3,075,670,000
Interest Expense, Borrowings	45,700,000	30,500,000
Interest Costs, Capitalized During Period	$ 15,500,000	$ 7,400,000

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Significant Accounting Policies

6 Months Ended

Jun. 30, 2011

Significant Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

1.  SIGNIFICANT ACCOUNTING POLICIES:

The accompanying financial statements, other than the balance sheet data as of December 31,2010, are unaudited and were prepared from the Company's records, but do not include all disclosures required by U.S. Generally Accepted Accounting Principles (“GAAP”). Balance sheet data as of December 31, 2010 was derived from the Company's audited financial statements. The Company's management believes that these financial statements include all adjustments necessary for a fair presentation of the Company's financial position and results of operations. All adjustments are of a normal and recurring nature unless specifically noted. The Company prepared these statements on a basis consistent with the Company's annual audited statements and Regulation S-X. Regulation S-X allows the Company to omit some of the footnote and policy disclosures required by generally accepted accounting principles and normally included in annual reports on Form 10-K. You should read these interim financial statements together with the financial statements, summary of significant accounting policies and notes to the Company's most recent annual report on Form 10-K.

Basis of presentation and principles of consolidation:  The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. The Company presents its financial statements in accordance with U.S. GAAP. All inter-company transactions and balances have been eliminated upon consolidation.

(a) Cash and Cash Equivalents:The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

(b) Restricted Cash:  Restricted cash represents cash received by the Company from production sold where the final division of ownership of the production is unknown or in dispute.

(c) Property, Plant and Equipment:  Capital assets are recorded at cost and depreciated using the declining-balance method based on a seven-year useful life. Gathering system expenditures are recorded at cost and depreciated using the straight-line method based on a 30-year useful life.

(d)Oil and Natural Gas Properties:The Company uses the full cost method of accounting for exploration and development activities as defined by the Securities and Exchange Commission (“SEC”)Release No. 33-8995, Modernization of Oil and Gas Reporting Requirements (“SEC Release No. 33-8995”) and Financial Accounting Standards Board (“FASB”)Accounting Standards Codification (“ASC”) Topic 932, Extractive Activities – Oil and Gas (“FASB ASC 932”). Under this method of accounting, the costs of unsuccessful, as well as successful, exploration and development activities are capitalized as oil and gas properties. This includes any internal costs that are directly related to exploration and development activities but does not include any costs related to production, general corporate overhead or similar activities. The carrying amount of oil and natural gas properties also includes estimated asset retirement costs recorded based on the fair value of the asset retirement obligation when incurred. Gain or loss on the sale or other disposition of oil and natural gas properties is not recognized, unless the gain or loss would significantly alter the relationship between capitalized costs and proved reserves of oil and natural gas attributable to a country.

The sum of net capitalized costs and estimated future development costs of oil and natural gas properties are amortized using the units-of-production method based on the Company's proved reserves. Oil and natural gas reserves and production are converted into equivalent units based on relative energy content. Asset retirement obligations are included in the base costs for calculating depletion.

Under the full cost method, costs of unevaluated properties and major development projects expected to require significant future costs may be excluded from capitalized costs being amortized. The Company excludes significant costs until proved reserves are found or until it is determined that the costs are impaired. Excluded costs, if any, are reviewed quarterly to determine if impairment has occurred. The amount of any impairment is transferred to the capitalized costs being amortized.

Companies that use the full cost method of accounting for oil and natural gas exploration and development activities are required to perform a ceiling test calculation each quarter. The full cost ceiling test is an impairment test prescribed by SEC Regulation S-X Rule 4-10. The ceiling test is performed quarterly, on a country-by-country basis, utilizing the average of prices in effect on the first day of the month for the preceding twelve month period in accordance with SEC Release No. 33-8995. The ceiling limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved crude oil and natural gas reserves discounted at 10%, plus the lower of cost or market value of unproved properties less any associated tax effects. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to earnings. Any such write-down will reduce earnings in the period of occurrence and results in a lower DD&A rate in future periods. A write-down may not be reversed in future periods even though higher oil and natural gas prices may subsequently increase the ceiling.

(e) Inventories:  Materials and supplies inventories are carried at cost. Inventory costs include expenditures and other charges directly and indirectly incurred in bringing the inventory to its existing condition and location. The Company uses the weighted average method of recording its inventory. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory cost. At June 30,2011, inventory of $2.9 million primarily included the cost of pipe and production equipment that are expected to be utilized during the 2011drilling program.

(f) Derivative Instruments and Hedging Activities:Currently, the Company largely relies on commodity derivative contracts to manage its exposure to commodity price risk. These commodity derivative contracts are typically referenced to natural gas index prices as published by independent third parties. Additionally, and from time to time, the Company enters into physical, fixed price forward natural gas sales in order to mitigate its commodity price exposure on a portion of its natural gas production. These fixed price forward natural gas sales are considered normal sales in the ordinary course of business and outside the scope of FASB ASC Topic 815, Derivatives and Hedging (“FASB ASC 815”). The Company does not offset the value of its derivative arrangements with the same counterparty. (See Note6).

(g) Income Taxes:Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are recorded related to deferred tax assets based on the “more likely than not” criteria described in FASB ASC Topic 740, Income Taxes. In addition, the Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit.

(h) Earnings Per Share:  Basic earnings per share is computed by dividing net earnings attributable to common stockholders by the weighted average number of common shares outstanding during each period. Diluted earnings per share is computed by adjusting the average number of common shares outstanding for the dilutive effect, if any, of common stock equivalents. The Company uses the treasury stock method to determine the dilutive effect.

		Three Months Ended				Six Months Ended
		June 30,		June 30,		June 30,		June 30,
		2011		2010		2011		2010
		(Share amounts in 000's)
Net income	$	103,505	$	61,493	$	172,226	$	263,869
Weighted average common shares outstanding - basic		152,899		152,300		152,749		152,187
Effect of dilutive instruments		1,478		2,010		1,749		2,081
Weighted average common shares outstanding - fully diluted		154,377		154,310		154,498		154,268
Net income per common share - basic	$	0.68	$	0.40	$	1.13	$	1.73
Net income per common share - fully diluted	$	0.67	$	0.40	$	1.11	$	1.71
Number of shares not included in dilutive earnings per share that would have been anti-dilutive because the exercise price was greater than the average market price of the common
shares		935		1,002		935		1,002

(i) Use of Estimates:  Preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

(j) Accounting for Share-Based Compensation:  The Company measures and recognizes compensation expense for all share-based payment awards made to employees and directors, including employee stock options, based on estimated fair values in accordance with FASB ASC Topic 718, Compensation – Stock Compensation.

(k) Fair Value Accounting:  The Company follows FASB ASC Topic 820, Fair Value Measurements and Disclosures (“FASB ASC 820”), which defines fair value, establishes a framework for measuring fair value under GAAP, and expands disclosures about fair value measurements. This statement applies under other accounting topics that require or permit fair value measurements. See Note 7 for additional information.

(l) Asset Retirement Obligation:  The initial estimated retirement obligation of properties is recognized as a liability with an associated increase in oil and gas properties for the asset retirement cost. Accretion expense is recognized over the estimated productive life of the related assets. If the fair value of the estimated asset retirement obligation changes, an adjustment is recorded to both the asset retirement obligation and the asset retirement cost. Revisions in estimated liabilities can result from changes in service and equipment costs and changes in the estimated timing of settling asset retirement obligations.

(m) Revenue Recognition:  Natural gas revenues are recorded based on the entitlement method. Under the entitlement method, revenue is recorded when title passes based on the Company's net revenue interest. The Company initially records its entitled share of revenues based on estimated production volumes. Subsequently, these estimated volumes are adjusted to reflect actual volumes that are supported by third party pipeline statements or cash receipts. Since there is a ready market for natural gas, the Company sells the majority of its products immediately after production at various locations at which time title and risk of loss pass to the buyer. Gas imbalances occur when the Company sells more or less than its entitled ownership percentage of total gas production. Any amount received in excess of the Company's share is treated as a liability. If the Company receives less than its entitled share, the underproduction is recorded as a receivable.

(n)Capitalized Interest:Interest is capitalized on the cost of unevaluated gas and oil 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.

(o)Capital Cost Accrual:The Company accrues for exploration and development costs in the period incurred, while payment may occur in a subsequent period.

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Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2011

Statement Significant Accounting Policies Policies [Abstract]

Cash and Cash Equivalents, Policy [Text Block]

(a) Cash and Cash Equivalents:The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Restricted Cash Policy

(b) Restricted Cash:  Restricted cash represents cash received by the Company from production sold where the final division of ownership of the production is unknown or in dispute.

Property, Plant and Equipment, Policy [Text Block]

(c) Property, Plant and Equipment:  Capital assets are recorded at cost and depreciated using the declining-balance method based on a seven-year useful life. Gathering system expenditures are recorded at cost and depreciated using the straight-line method based on a 30-year useful life.

Oil and natural gas properties

(d)Oil and Natural Gas Properties:The Company uses the full cost method of accounting for exploration and development activities as defined by the Securities and Exchange Commission (“SEC”)Release No. 33-8995, Modernization of Oil and Gas Reporting Requirements (“SEC Release No. 33-8995”) and Financial Accounting Standards Board (“FASB”)Accounting Standards Codification (“ASC”) Topic 932, Extractive Activities – Oil and Gas (“FASB ASC 932”). Under this method of accounting, the costs of unsuccessful, as well as successful, exploration and development activities are capitalized as oil and gas properties. This includes any internal costs that are directly related to exploration and development activities but does not include any costs related to production, general corporate overhead or similar activities. The carrying amount of oil and natural gas properties also includes estimated asset retirement costs recorded based on the fair value of the asset retirement obligation when incurred. Gain or loss on the sale or other disposition of oil and natural gas properties is not recognized, unless the gain or loss would significantly alter the relationship between capitalized costs and proved reserves of oil and natural gas attributable to a country.

The sum of net capitalized costs and estimated future development costs of oil and natural gas properties are amortized using the units-of-production method based on the Company's proved reserves. Oil and natural gas reserves and production are converted into equivalent units based on relative energy content. Asset retirement obligations are included in the base costs for calculating depletion.

Under the full cost method, costs of unevaluated properties and major development projects expected to require significant future costs may be excluded from capitalized costs being amortized. The Company excludes significant costs until proved reserves are found or until it is determined that the costs are impaired. Excluded costs, if any, are reviewed quarterly to determine if impairment has occurred. The amount of any impairment is transferred to the capitalized costs being amortized.

Companies that use the full cost method of accounting for oil and natural gas exploration and development activities are required to perform a ceiling test calculation each quarter. The full cost ceiling test is an impairment test prescribed by SEC Regulation S-X Rule 4-10. The ceiling test is performed quarterly, on a country-by-country basis, utilizing the average of prices in effect on the first day of the month for the preceding twelve month period in accordance with SEC Release No. 33-8995. The ceiling limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved crude oil and natural gas reserves discounted at 10%, plus the lower of cost or market value of unproved properties less any associated tax effects. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to earnings. Any such write-down will reduce earnings in the period of occurrence and results in a lower DD&A rate in future periods. A write-down may not be reversed in future periods even though higher oil and natural gas prices may subsequently increase the ceiling.

Inventory, Policy [Text Block]

(e) Inventories:  Materials and supplies inventories are carried at cost. Inventory costs include expenditures and other charges directly and indirectly incurred in bringing the inventory to its existing condition and location. The Company uses the weighted average method of recording its inventory. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory cost. At June 30,2011, inventory of $2.9 million primarily included the cost of pipe and production equipment that are expected to be utilized during the 2011drilling program.

Derivatives, Policy [Text Block]

(f) Derivative Instruments and Hedging Activities:Currently, the Company largely relies on commodity derivative contracts to manage its exposure to commodity price risk. These commodity derivative contracts are typically referenced to natural gas index prices as published by independent third parties. Additionally, and from time to time, the Company enters into physical, fixed price forward natural gas sales in order to mitigate its commodity price exposure on a portion of its natural gas production. These fixed price forward natural gas sales are considered normal sales in the ordinary course of business and outside the scope of FASB ASC Topic 815, Derivatives and Hedging (“FASB ASC 815”). The Company does not offset the value of its derivative arrangements with the same counterparty. (See Note6).

Income Tax, Policy [Text Block]

(g) Income Taxes:Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are recorded related to deferred tax assets based on the “more likely than not” criteria described in FASB ASC Topic 740, Income Taxes. In addition, the Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit.

Earnings Per Share, Policy [Text Block]

(h) Earnings Per Share:  Basic earnings per share is computed by dividing net earnings attributable to common stockholders by the weighted average number of common shares outstanding during each period. Diluted earnings per share is computed by adjusting the average number of common shares outstanding for the dilutive effect, if any, of common stock equivalents. The Company uses the treasury stock method to determine the dilutive effect.

		Three Months Ended				Six Months Ended
		June 30,		June 30,		June 30,		June 30,
		2011		2010		2011		2010
		(Share amounts in 000's)
Net income	$	103,505	$	61,493	$	172,226	$	263,869
Weighted average common shares outstanding - basic		152,899		152,300		152,749		152,187
Effect of dilutive instruments		1,478		2,010		1,749		2,081
Weighted average common shares outstanding - fully diluted		154,377		154,310		154,498		154,268
Net income per common share - basic	$	0.68	$	0.40	$	1.13	$	1.73
Net income per common share - fully diluted	$	0.67	$	0.40	$	1.11	$	1.71
Number of shares not included in dilutive earnings per share that would have been anti-dilutive because the exercise price was greater than the average market price of the common
shares		935		1,002		935		1,002

Use of estimates

(i) Use of Estimates:  Preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Compensation Related Costs, Policy [Text Block]

(j) Accounting for Share-Based Compensation:  The Company measures and recognizes compensation expense for all share-based payment awards made to employees and directors, including employee stock options, based on estimated fair values in accordance with FASB ASC Topic 718, Compensation – Stock Compensation.

Fair value accounting

(k) Fair Value Accounting:  The Company follows FASB ASC Topic 820, Fair Value Measurements and Disclosures (“FASB ASC 820”), which defines fair value, establishes a framework for measuring fair value under GAAP, and expands disclosures about fair value measurements. This statement applies under other accounting topics that require or permit fair value measurements. See Note 7 for additional information.

Asset Retirement Obligations and Environmental Cost, Policy [Text Block]

(l) Asset Retirement Obligation:  The initial estimated retirement obligation of properties is recognized as a liability with an associated increase in oil and gas properties for the asset retirement cost. Accretion expense is recognized over the estimated productive life of the related assets. If the fair value of the estimated asset retirement obligation changes, an adjustment is recorded to both the asset retirement obligation and the asset retirement cost. Revisions in estimated liabilities can result from changes in service and equipment costs and changes in the estimated timing of settling asset retirement obligations.

Revenue Recognition, Policy [Text Block]

(m) Revenue Recognition:  Natural gas revenues are recorded based on the entitlement method. Under the entitlement method, revenue is recorded when title passes based on the Company's net revenue interest. The Company initially records its entitled share of revenues based on estimated production volumes. Subsequently, these estimated volumes are adjusted to reflect actual volumes that are supported by third party pipeline statements or cash receipts. Since there is a ready market for natural gas, the Company sells the majority of its products immediately after production at various locations at which time title and risk of loss pass to the buyer. Gas imbalances occur when the Company sells more or less than its entitled ownership percentage of total gas production. Any amount received in excess of the Company's share is treated as a liability. If the Company receives less than its entitled share, the underproduction is recorded as a receivable.

Interest Expense, Policy [Text Block]

(n)Capitalized Interest:Interest is capitalized on the cost of unevaluated gas and oil 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.

Capital cost accrual policy

(o)Capital Cost Accrual:The Company accrues for exploration and development costs in the period incurred, while payment may occur in a subsequent period.

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Share Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Share Based Compensation Tables [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Text Block]

4. SHARE BASED COMPENSATION:
Valuation and Expense Information
			Three Months				Six Months
			Ended June 30,				Ended June 30,
			2011		2010		2011		2010
	Total cost of share-based payment plans	$	5,007	$	5,809	$	10,131	$	10,494
	Amounts capitalized in fixed assets	$	1,683	$	2,453	$	3,685	$	4,357
	Amounts charged against income, before
	income tax benefit	$	3,324	$	3,356	$	6,446	$	6,137
	Amount of related income tax benefit recognized
	in income	$	1,193	$	1,191	$	2,314	$	2,179

Stock Option Activity

Changes in Stock Options and Stock Options Outstanding

The following table summarizes the changes in stock options for the six months ended June 30, 2011 and the year ended December 31, 2010:

		Weighted
	Number of	Average
	Options	Exercise Price
	(000's)	(US$)
Balance, December 31, 2009	3,504	$	1.49	to	$	98.87
Forfeited	(68)	$	51.60	to	$	76.01
Exercised	(1,206)	$	1.49	to	$	45.95
Balance, December 31, 2010	2,230	$	3.91	to	$	98.87
Forfeited	(2)	$	51.60	to	$	75.18
Exercised	(645)	$	3.91	to	$	33.57
Balance, June 30, 2011	1,583	$	11.68	to	$	98.87

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Consolidated Statement of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues [Abstract]
Natural Gas Production Revenue	$ 249,835	$ 206,208	$ 481,751	$ 456,955
Oil and Condensate Revenue	30,732	22,180	56,107	44,557
Oil and Gas Revenue	280,567	228,388	537,858	501,512
Operating Expenses [Abstract]
Lease operating expenses	11,115	11,534	23,472	21,858
Production taxes	24,846	22,487	48,119	50,893
Gathering fees	13,910	12,498	26,917	24,453
Transportation charges	16,273	16,522	32,431	32,427
Depletion of Oil and Gas Properties	79,219	56,853	152,978	108,120
General and Administrative Expense	6,002	6,105	13,113	12,507
Costs and Expenses	151,365	125,999	297,030	250,258
Operating Income (Loss)	129,202	102,389	240,828	251,254
Other Nonoperating Income (Expense) [Abstract]
Interest Expense, Debt	(15,590)	(11,437)	(30,180)	(23,156)
Gain (loss) on commodity derivatives	47,606	14,566	63,241	195,917
Litigation Settlement, Expense	0	(9,902)	0	(9,902)
Other income (expense) net	(4)	22	16	173
Other Nonoperating Income (Expense)	32,012	(6,751)	33,077	163,032
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest	161,214	95,638	273,905	414,286
Income Tax Expense (Benefit)	57,709	34,145	101,679	150,417
Net Income (Loss)	$ 103,505	$ 61,493	$ 172,226	$ 263,869
Earnings Per Share, Basic [Abstract]
Earnings Per Share, Basic	$ 0.68	$ 0.40	$ 1.13	$ 1.73
Fully Diluted Earnings per Share:
Earnings Per Share, Diluted	$ 0.67	$ 0.40	$ 1.11	$ 1.71
Weighted Average Number of Shares Outstanding, Basic	152,899	152,300	152,749	152,187
Weighted Average Number of Shares Outstanding, Diluted	154,377	154,310	154,498	154,268