CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
INVESTMENTS IN REAL ESTATE, at cost:
Operating properties	$ 3,216,231us-gaap_RentalProperties	$ 3,450,317us-gaap_RentalProperties
Construction in progress	60,452us-gaap_ConstructionInProgressGross	68,835us-gaap_ConstructionInProgressGross
Land held for development	8,721us-gaap_LandAvailableForDevelopment	8,716us-gaap_LandAvailableForDevelopment
Total investments in real estate	3,285,404	3,527,868
Accumulated depreciation	(1,061,051)	(1,012,746)
Net investments in real estate	2,224,353us-gaap_RealEstateInvestmentPropertyNet	2,515,122us-gaap_RealEstateInvestmentPropertyNet
INVESTMENTS IN PARTNERSHIPS, at equity:	140,882	15,963
OTHER ASSETS:
Cash and cash equivalents	40,433	34,230
Tenant and other receivables (net of allowance for doubtful accounts of $11,929 and $13,123 at December 31, 2014 and 2013, respectively)	40,566us-gaap_AccountsReceivableNet	46,439us-gaap_AccountsReceivableNet
Intangible assets (net of accumulated amortization of $11,873 and $14,506 at December 31, 2014 and 2013, respectively)	6,452pei_IntangibleAssetsIncludingGoodwill	9,075pei_IntangibleAssetsIncludingGoodwill
Deferred costs and other assets	87,017us-gaap_DeferredCostsAndOtherAssets	97,752us-gaap_DeferredCostsAndOtherAssets
Total assets	2,539,703us-gaap_Assets	2,718,581us-gaap_Assets
LIABILITIES:
Mortgage loans payable	1,407,947us-gaap_SecuredDebt	1,502,650us-gaap_SecuredDebt
Term Loans	130,000us-gaap_SecuredLongTermDebt	0us-gaap_SecuredLongTermDebt
Revolving Facility	0us-gaap_LineOfCredit	130,000us-gaap_LineOfCredit
Tenants’ deposits and deferred rent	15,541pei_TenantsDepositsAndDeferredRent	17,896pei_TenantsDepositsAndDeferredRent
Distributions in excess of partnership investments	65,956	64,491
Fair value of derivative instruments	2,490us-gaap_DerivativeLiabilities	844us-gaap_DerivativeLiabilities
Accrued expenses and other liabilities	73,032	76,248
Total liabilities	1,694,966us-gaap_Liabilities	1,792,129us-gaap_Liabilities
COMMITMENTS AND CONTINGENCIES (Note 11)
EQUITY:
Shares of beneficial interest, $1.00 par value per share; 200,000 shares authorized; issued and outstanding 68,801 shares at December 31, 2014 and 68,293 shares at December 31, 2013	68,801us-gaap_CommonStockValue	68,293us-gaap_CommonStockValue
Capital contributed in excess of par	1,474,183us-gaap_AdditionalPaidInCapital	1,467,460us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss	(6,002)	(6,637)
Distributions in excess of net income	(721,605)	(636,939)
Total equity – Pennsylvania Real Estate Investment Trust	815,458us-gaap_StockholdersEquity	892,258us-gaap_StockholdersEquity
Noncontrolling interest	29,279us-gaap_MinorityInterest	34,194us-gaap_MinorityInterest
Total equity	844,737	926,452
Total liabilities and equity	2,539,703	2,718,581
Series A Preferred Shares[Member]
EQUITY:
Preferred shares, value	46	46
Total equity	46	46
Series B Preferred Shares [Member]
EQUITY:
Preferred shares, value	35	35
Total equity	$ 35	$ 35

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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No definition available.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Carrying amount of land available for development.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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