Summary of Significant Accounting Policies (Policy)	6 Months Ended
Summary of Significant Accounting Policies (Policy)	Jun. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Our consolidated financial statements include the accounts of our subsidiaries, certain partially owned real estate joint ventures or partnerships and variable interest entities (“VIEs”) which meet the guidelines for consolidation. All intercompany balances and transactions have been eliminated. The condensed consolidated financial statements included in this report are unaudited; however, amounts presented in the condensed consolidated balance sheet as of December 31, 2014 are derived from our audited financial statements at that date. In our opinion, all adjustments necessary for a fair presentation of such financial statements have been included. Such adjustments consisted of normal recurring items. Interim results are not necessarily indicative of results for a full year. The condensed consolidated financial statements and notes are presented as permitted by Form 10-Q and certain information included in our annual financial statements and notes thereto has been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2014. Our financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Such statements require management to make estimates and assumptions that affect the reported amounts on our consolidated financial statements. Actual results could differ from these estimates.
Restricted Deposits and Mortgage Escrows	Restricted Deposits and Mortgage Escrows Restricted deposits and mortgage escrows consist of escrow deposits held by lenders primarily for property taxes, insurance and replacement reserves and restricted cash that is held for a specific use or in a qualified escrow account for the purposes of completing like-kind exchange transactions.
New Accounting Pronouncements	In April 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity." This ASU amends the criteria for reporting discontinued operations while enhancing disclosures in this area. The provisions of ASU No. 2014-08 was effective for us prospectively on January 1, 2015; however, early adoption was permitted. We adopted this update effective April 1, 2014. The adoption resulted in individual center disposals no longer qualifying for discontinued operations presentation; thus, the results of these disposals will remain in income from continuing operations, and any associated gains are included in gain on sale of property. Centers sold or classified as held for sale prior to April 1, 2014, are not subject to ASU No. 2014-08 and therefore, continue to be classified as discontinued operations using the previous definition. In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers." This ASU's core objective is for an entity to recognize revenue based on the consideration it expects to receive in exchange for goods or services. Additionally, this ASU requires entities to use a single model in accounting for revenues derived from contracts with customers. ASU No. 2014-09 replaces prior guidance regarding the recognition of revenue from sales of real estate except for revenue from sales that are part of a sale-leaseback transaction. The provisions of ASU No. 2014-09 are effective for us on January 1, 2018, and are required to be applied either on a retrospective or a modified retrospective approach. We are currently assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements. In August 2014, the FASB issued ASU No. 2014-15, "Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern." This ASU's core objective is that management should evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued or are available to be issued. The provisions of ASU No. 2014-15 are effective for us as of December 31, 2016, and early adoption is permitted. We do not expect the adoption of this update to have any impact to our consolidated financial statements. In January 2015, the FASB issued ASU No. 2015-01, "Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items." This ASU eliminates the concept of extraordinary items from GAAP. The provisions of ASU No. 2015-01 are effective for us as of January 1, 2016, and early adoption is permitted. We adopted this ASU on January 1, 2015, and the adoption of this ASU did not impact our consolidated financial statements. In February 2015, the FASB issued ASU No. 2015-02, "Amendments to the Consolidation Analysis." This ASU amends the consolidation analysis required under GAAP and requires management to reevaluate all previous consolidation conclusions. ASU No. 2015-02 considers limited partnerships as VIEs, unless the limited partners have either substantive kick-out or participating rights. The presumption that a general partner should consolidate a limited partnership has also been eliminated. The ASU amends the effect that fees paid to a decision maker or service provider have on the consolidation analysis, as well as amends how variable interests held by a reporting entity's related parties affect the consolidation conclusion. The ASU also clarifies how to determine whether equity holders as a group have power over an entity. The provisions of ASU No. 2015-02 are effective for us as of January 1, 2016, and early adoption is permitted. We are currently assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, "Simplifying the Presentation of Debt Issuance Costs." The ASU requires debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, and amortization of the debt issuance costs will continue to be reported as interest expense. The provisions of ASU No. 2015-03 are effective for us as of January 1, 2016, and are required to be applied retrospectively. Early adoption of ASU No. 2015-03 is permitted. We do not expect the adoption of this update to have any impact on our consolidated statements of operations or cash flows, except that the presentation requirements under this ASU will impact certain line items of our consolidated balance sheet. As of June 30, 2015 and December 31, 2014, the impact would be an estimated decrease to Unamortized Debt and Lease Costs, net and Debt, net of $11.0 million and $8.2 million, respectively. In April 2015, the FASB issued ASU No. 2015-05, "Customer's Accounting for Fees Paid in a Cloud Computing Arrangement." This ASU provides guidance on determining whether a cloud computing arrangement contains a software license that should be accounted for as internal-use software. The provisions of ASU No. 2015-05 are effective for us as of January 1, 2016, and early adoption is permitted. We do not expect the adoption of this ASU to have a material impact to our consolidated financial statements

Entity's cash and cash equivalents accounting policy with respect to restricted balances. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.