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Basis Of Presentation (Policy)

6 Months Ended

Jun. 30, 2011

Presentation. In the opinion of management, the consolidated financial statements of the Company as of June 30, 2011 and for the three and six months ended June 30, 2011 and 2010 include all adjustments and accruals, consisting only of normal recurring accrual adjustments, which are necessary for a fair presentation of the results for the interim periods. These interim results are not necessarily indicative of results for a full year.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("GAAP") have been condensed or omitted in this report pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). These consolidated financial statements should be read in connection with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2010.

Discontinued Operations

Discontinued operations. During December 2010, the Company committed to a plan to divest 100 percent of the Company's share holdings in Pioneer Natural Resources Tunisia Ltd. and Pioneer Natural Resources Anaguid Ltd. (referred to in the aggregate as "Pioneer Tunisia"). In February 2011, the Company completed the sale of Pioneer Tunisia to an unaffiliated third party. Accordingly, the Company classified the assets and liabilities of Pioneer Tunisia as discontinued operations held for sale in the accompanying balance sheet as of December 31, 2010 and has classified the results of operations of Pioneer Tunisia as discontinued operations, net of tax for the three and six months ended June 30, 2011 and 2010 in the accompanying consolidated statements of operations (representing a recasting of the Pioneer Tunisia results of operations for the three and six months ended June 30, 2010, which were originally classified as continuing operations). See Note Q for more information regarding the sale of Pioneer Tunisia.

During the six months ended June 30, 2011 and 2010, the Bureau of Ocean Energy Management, Regulation, and Enforcement (the "BOEMRE") paid the Company $2.0 million and $35.3 million, respectively, of interest on excess royalty payments associated with properties that were sold by the Company during 2006. Accordingly, the Company has classified the interest income as components of income from discontinued operations, net of tax in the accompanying consolidated statements of operations.

Allowances For Doubtful Accounts

Allowances for doubtful accounts. As of June 30, 2011 and December 31, 2010, the Company's allowances for doubtful accounts totaled $1.4 million and $3.7 million, respectively. Changes in the Company's allowance for doubtful accounts during the three and six months ended June 30, 2011 are summarized in the following table:


	Three Months Ended June 30, 2011			Six Months Ended June 30, 2011
	(in thousands)

Beginning allowance for doubtful accounts balance	$	3,535		$	3,674
Amount recorded in other expense for bad debt recoveries		(1,815	)		(1,797	)
Other net decreases		(306	)		(463	)

Ending allowance for doubtful accounts balance	$	1,414		$	1,414

Inventories

Inventories. Inventories used in continuing operations consisted of $247.9 million and $183.4 million of materials and supplies and $4.1 million and $3.9 million of commodities as of June 30, 2011 and December 31, 2010, respectively. As of June 30, 2011 and December 31, 2010, the Company's materials and supplies inventory was net of $2.5 million and $3.6 million, respectively, of valuation reserve allowances. As of June 30, 2011 and December 31, 2010, the Company estimated that $17.9 million and $13.7 million, respectively, of its materials and supplies inventory would not be utilized or sold within one year. Accordingly, those inventory values have been classified as other noncurrent assets in the accompanying consolidated balance sheets. As of December 31, 2010, the Company also had inventory in Tunisia totaling $13.6 million that is classified as discontinued operations held for sale in the accompanying consolidated balance sheet as of December 31, 2010.

Derivatives And Hedging

Derivatives and hedging. All derivatives are recorded in the accompanying consolidated balance sheets at estimated fair value. See Note D for further information regarding the fair value of the Company's derivatives. Effective February 1, 2009, the Company discontinued hedge accounting on all of its then-existing hedge contracts. Changes in the fair value of effective cash flow hedges prior to the Company's discontinuance of hedge accounting were recorded as a component of accumulated other comprehensive income – net deferred hedge gains, net of tax ("AOCI – Hedging"), in the stockholders' equity section of the accompanying consolidated balance sheets, and are being transferred to earnings during the same periods in which the hedged transactions are recognized in the Company's earnings. Since February 1, 2009, the Company has recognized all changes in the fair values of its derivative contracts as gains or losses in the earnings of the periods in which they occur.

The Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. Net derivative asset values are determined, in part, by utilization of the derivative counterparties' credit-adjusted risk-free rate curves and net derivative liabilities are determined, in part, by utilization of the Company's and Pioneer Southwest Energy Partners L.P.'s ("Pioneer Southwest," a majority-owned and consolidated subsidiary) credit-adjusted risk-free rate curves. The credit-adjusted risk-free rate curves for the Company and the counterparties are based on their independent market-quoted credit default swap rate curves plus the United States Treasury Bill yield curve as of the valuation date. Pioneer Southwest's credit-adjusted risk-free rate curve is based on independent market-quoted forward London Interbank Offered Rate ("LIBOR") curves plus 250 basis points, representing Pioneer Southwest's estimated borrowing rate.

Goodwill

Goodwill. Goodwill is assessed for impairment whenever events or circumstances indicate that impairment of the carrying value of goodwill is likely, but no less often than annually. If the carrying value of goodwill is determined to be impaired, it is reduced for the impaired value with a corresponding charge to pretax earnings in the period in which it is determined to be impaired. During the third quarter of 2010, the Company performed its annual assessment of goodwill impairment and determined that there was no impairment

Noncontrolling Interest In Consolidated Subsidiaries

Noncontrolling interest in consolidated subsidiaries. The Company owns a 0.1 percent general partner interest and a 61.9 percent limited partner interest in Pioneer Southwest. Pioneer Southwest owns interests in certain oil and gas properties in the Spraberry field in the Permian Basin of West Texas. The financial position, results of operations and cash flows of Pioneer Southwest are consolidated with those of the Company.

The Company also owns a majority interest in Sendero Drilling Company, LLC ("Sendero"), which owns and operates land-based drilling rigs in the United States. In addition, the Company owns the majority interests in certain other subsidiaries with operations in the United States.

Noncontrolling interest in the net assets of consolidated subsidiaries totaled $101.0 million and $105.4 million as of June 30, 2011 and December 31, 2010, respectively. The Company recorded net income attributable to the noncontrolling interests of $20.1 million and $15.3 million for the three and six months ended June 30, 2011, respectively (principally related to Pioneer Southwest), compared to net income attributable to the noncontrolling interests of $21.1 million and $36.5 million for the three and six months ended June 30, 2010, respectively.

Investment In Unconsolidated Affiliate

Investment in unconsolidated affiliate. The Company owns a 50.1 percent interest in EFS Midstream LLC ("EFS Midstream"), which owns and operates natural gas and liquids gathering, treating and transportation assets in the Eagle Ford Shale area of South Texas.

The Company accounts for the EFS Midstream investment under the equity method of accounting for investments in unconsolidated affiliates. Under the equity method, the Company's investment in unconsolidated affiliates is increased for investments made and the investor's share of the investee's net income, and decreased for distributions received, the carrying value of investor's interests sold and the investor's share of the investee's net losses. The Company's equity interest in the net income of EFS Midstream is recorded in interest and other income in the Company's accompanying consolidated statements of operations.

Stock-Based Compensation

Stock-based compensation. For stock-based compensation equity awards granted or modified, compensation expense is being recognized in the Company's financial statements on a straight line basis over the awards' vesting periods based on their fair values on the dates of grant. The amount of compensation expense recognized at any date is at least equal to the portion of the measurement date (normally the grant date) value of the award that is vested at that date. The Company utilizes (i) the Black-Scholes option pricing model to measure the fair value of stock options, (ii) the prior day's closing stock price on the date of grant for the fair value of restricted stock, restricted stock units, partnership unit awards or phantom unit awards that are expected to be settled wholly in the Company's common stock or Pioneer Southwest common units ("Equity Awards"), (iii) the Monte Carlo simulation method for the fair value of performance unit awards and (iv) a probabilistic forecasted fair value method for series B unit awards issued by Sendero.

Stock-based compensation liability awards are awards that are expected to be settled wholly or partially in cash on their vesting dates, rather than in shares or units ("Liability Awards"). Stock-based Liability Awards are recorded as accounts payable – affiliates based on the fair value of the services that have been rendered on the unvested portions of the awards on the balance sheet date. The fair values of Liability Awards are updated at each balance sheet date and changes in the fair values of the unvested portions of the awards for which services have been rendered are recorded as increases or decreases to compensation expense. As of June 30, 2011, accounts payable – due to affiliates includes $3.9 million of liabilities attributable to the Liability Awards.

For the three and six months ended June 30, 2011, the Company recorded $13.8 million and $26.4 million, respectively, of stock-based compensation costs for all plans, as compared to $10.5 million and $20.6 million for the same respective periods of 2010. As of June 30, 2011, there was $93.1 million of unrecognized compensation expense related to unvested share- and unit-based compensation plan awards, including $21.6 million attributable to Liability Awards. This compensation will be recognized over the remaining vesting periods of the awards, which on a weighted average basis is a period of less than three years.

The Company's issued shares, as reflected in the consolidated balance sheets at June 30, 2011 and December 31, 2010, do not include 536,775 and 825,796 common shares, respectively, associated with unvested stock-based compensation awards that have voting rights.

The following table summarizes the activity that occurred during the six months ended June 30, 2011, for each type of share-based incentive award issued by Pioneer:


	Restricted Stock Equity Awards			Restricted Stock Liability Awards			Performance Units			Stock Options			Pioneer Southwest LTIP Restricted Units			Pioneer Southwest LTIP Phantom Units

Outstanding at December 31, 2010		2,559,779			215,134			263,729			507,539			12,212			35,118
Awards granted		427,384			182,982			43,495			86,903			6,812			30,039
Awards vested		(1,015,713	)		(63,556	)		(14,807	)		—			(11,532	)		—
Options exercised		—			—			—			(15,290	)		—			—
Awards forfeited		(37,914	)		(11,931	)		—			—			—			—

Outstanding at June 30, 2011		1,933,536			322,629			292,417			579,152			7,492			65,157