ORGANIZATION AND BASIS OF PRESENTATION (Policies)	3 Months Ended
ORGANIZATION AND BASIS OF PRESENTATION (Policies)	Mar. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the consolidated accounts of the Company and its investments in entities in which the Company is presumed to have control in accordance with the consolidation guidance of the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC"). Investments in entities for which the Company has the ability to exercise significant influence but does not have financial or operating control are accounted for under the equity method of accounting. Accordingly, the Company's share of the net earnings (or losses) of entities accounted for under the equity method are included in consolidated net income under the caption, Equity in Earnings (Losses) of Unconsolidated Affiliates. Investments in entities for which the Company does not have the ability to exercise any influence are accounted for under the cost method. The Company owns a 22.22% interest in an approximately one million square foot retail portfolio (the "Brandywine Portfolio") located in Wilmington, Delaware. Effective January 1, 2013, following certain changes in the financial and operating controls of the joint venture, the Company now accounts for this investment on a consolidated basis. The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States ("GAAP") for interim financial information and with the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates. Operating results for the three months ended March 31, 2013 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2013. The information furnished in the accompanying consolidated financial statements reflects all adjustments that, in the opinion of management, are necessary for a fair presentation of the aforementioned consolidated financial statements for the interim period. These consolidated financial statements should be read in conjunction with the Company's 2012 Annual Report on Form 10-K, as filed with the SEC on February 27, 2013.
Reclassifications	Reclassifications Certain reclassifications have been made to the 2012 financial statements to conform to the 2013 presentation.
Real Estate	Real Estate The Company reviews its long-lived assets for impairment when there is an event or change in circumstances that indicates that the carrying amount may not be recoverable. The Company records impairment losses and reduces the carrying value of properties when indicators of impairment are present and the expected undiscounted cash flows related to those properties are less than their carrying amounts. In cases where the Company does not expect to recover its carrying costs on properties held for use, the Company reduces its carrying cost to fair value, and for properties held-for-sale, the Company reduces its carrying value to the fair value less costs to dispose. Management does not believe that the values of any of the Company's properties are impaired as of March 31, 2013.
Recent Accounting Pronouncements	Recent Accounting Pronouncements During February 2013, the FASB issued Accounting Standards Update ("ASU") No. 2013-02, "Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income." ASU 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. ASU 2013-02 is effective prospectively for reporting periods beginning after December 15, 2012. The Company adopted ASU 2013-02 as of January 1, 2013 and the adoption did not have a material impact on the Company's financial condition or results of operations.