The Company and Financial Statement Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation and consolidation	Basis of Presentation and Consolidation. The Company's unaudited condensed consolidated financial statements are prepared on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”). The financial statements reflect the accounts of the Company and its consolidated subsidiaries. The Company consolidates its wholly-owned subsidiaries and its partnerships and joint ventures which it controls (1) through voting rights or similar rights or (2) by means other than voting rights if the Company is the primary beneficiary of a variable interest entity ("VIE"). Entities which the Company does not control and entities which are VIEs in which the Company is not the primary beneficiary are accounted for under appropriate GAAP. The financial statements contained in this Quarterly Report on Form 10-Q for the three months ended March 31, 2015 (this “Quarterly Report”) have been prepared by the Company in accordance with GAAP for interim financial information and the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all information and footnotes required by GAAP for complete financial statements. However, in the opinion of management, the interim financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the results of the periods presented. The results of operations for the three months ended March 31, 2015 and 2014, are not necessarily indicative of the results that may be expected for the full year. These unaudited condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included in the Company's Form 10-K for the year ended December 31, 2014 filed with the SEC on February 26, 2015 (“Annual Report”).
Use of estimates	Use of Estimates. Management has made a number of significant estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses to prepare these unaudited condensed consolidated financial statements in conformity with GAAP. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. The current economic environment has increased the degree of uncertainty inherent in these estimates and assumptions. Management adjusts such estimates when facts and circumstances dictate. The most significant estimates made include the recoverability of accounts receivable, the allocation of property purchase price to tangible and intangible assets acquired and liabilities assumed, the determination of VIEs and which entities should be consolidated, the determination of impairment of long-lived assets, loans receivable and equity method investments, the valuation of derivative financial instruments and the useful lives of long-lived assets. Actual results could differ materially from those estimates.
Fair value measurements	Fair Value Measurements. The Company follows the guidance in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures, as amended (“Topic 820”), to determine the fair value of financial and non-financial instruments. Topic 820 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 - observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 - unobservable inputs, which are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as considering counterparty credit risk. The Company has formally elected to apply the portfolio exception within Topic 820 with respect to measuring counterparty risk for all of its derivative transactions subject to master netting arrangements.
Acquisition, development and construction arrangements	Acquisition, Development and Construction Arrangements. The Company evaluates loans receivable where the Company participates in residual profits through loan provisions or other contracts to ascertain whether the Company has the same risks and rewards as an owner or a joint venture partner. Where the Company concludes that such arrangements are more appropriately treated as an investment in real estate, the Company reflects such loan receivable as an equity investment in real estate under construction in the unaudited condensed consolidated balance sheets. In these cases, no interest income is recorded on the loan receivable and the Company capitalizes interest during the construction period. In arrangements where the Company engages a developer to construct a property or provides funds to a tenant to develop a property, the Company will capitalize the funds provided to the developer/tenant and internal costs of interest and real estate taxes, if applicable, during the construction period.
Reclassifications	Reclassifications. Certain amounts included in the 2014 unaudited condensed consolidated financial statements have been reclassified, primarily relating to discontinued operations, to conform to the 2015 presentation.
Recently issued accounting guidance	Recently Issued Accounting Guidance. In April 2014, the FASB issued Accounting Standards Update No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for reporting discontinued operations and improves financial statement disclosures. Under this guidance, only disposals representing a strategic shift in operations that have a major effect on an organization's operations and financial results should be presented as discontinued operations. The Company adopted this guidance effective January 1, 2015. The guidance requires the Company to continue to classify any property disposal or property classified as held for sale as of December 31, 2014 as discontinued operations prospectively. Therefore, the revenues and expenses related to these properties are presented as discontinued operations as of March 31, 2015. The Company did not classify any additional properties as discontinued operations subsequent to December 31, 2014 as the dispositions did not represent a strategic shift in operations. The implementation of this guidance did not have a material impact on the Company's financial position, results of operations or cash flows. In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), which amends the guidance for revenue recognition to eliminate the industry-specific revenue recognition guidance and replace it with a principle based approach for determining revenue recognition. The new guidance is effective for reporting periods beginning after December 15, 2016. The Company is currently evaluating the impact of the adoption of the new guidance on its unaudited condensed consolidated financial statements. In February 2015, the FASB issued Accounting Standards Update 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis, which provides guidance on the consolidation evaluation for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. In accordance with the guidance, all legal entities are subject to reevaluation under the revised consolidation model. The guidance is effective in the first quarter of 2016 and early adoption is allowed. The Company is currently evaluating the impact of the adoption of this new guidance on its unaudited condensed consolidated financial statements. In April 2015, the FASB issued Accounting Standards Update 2015-03, Simplifying the Presentation of Debt Issuance Costs, which requires that debt issuance costs be presented on the balance sheet as a direct deduction from the carrying amount of the related debt liability. The guidance is effective in the first quarter of 2016 and requires retrospective application. The Company is currently evaluating the impact of the adoption of this new guidance on its unaudited condensed consolidated financial statements.