Newly Issued Accounting Pronouncements	12 Months Ended
Dec. 31, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Newly Issued Accounting Pronouncements	Newly Issued Accounting Pronouncements Adopted In April 2014, the FASB issued 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 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 early adopted this update effective January 1, 2016, and the adoption did not have any impact to 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 were effective for us as of January 1, 2016. Upon adoption of this update, we have reported 10 additional entities as VIEs, since the limited partners in these entities do not have either substantive kick-out or participating rights. The adoption expanded our VIE disclosures for these 10 entities, but had no impact to our consolidated balance sheets or consolidated statements of operations or cash flows as the consolidation status of these entities did not change. Retrospective disclosures associated with our VIEs were made to conform to the current year presentation. In September 2015, the FASB issued ASU No. 2015-16, "Simplifying the Accounting for Measurement-Period Adjustments." This ASU allows measurement-period adjustments associated with business combinations recorded in the reporting period in which the adjustment amounts are determined, rather than retrospectively, as if the accounting for the business combination had been completed as of the acquisition date. The provisions of ASU No. 2015-16 were effective for us as of January 1, 2016. We have adopted this update, and the adoption did not have have any impact to our consolidated financial statements. Not Yet Adopted 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, as amended in subsequently issued amendments, are effective for us on January 1, 2018, and are required to be applied either on a retrospective or a modified retrospective approach. In anticipation of adopting this ASU, we have formed a team to determine the elements of the ASU that impact our contracts. As each sale contract is unique in our industry, many of the contracts will have to be re-reviewed. We are assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements, which may include the timing related to sales recognition on real estate. Also, we are evaluating whether we will adopt on a retrospective basis or modified retrospective basis. In January 2016, the FASB issued ASU No. 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities." This ASU will require equity investments, excluding those investments accounted for under the equity method of accounting or those that result in consolidation of the investee, to be measured at fair value with the changes in fair value recognized in net income; will simplify the impairment assessment of those investments; will eliminate the disclosure of the method(s) and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost and change the fair value calculation for those investments; will change the disclosure in other comprehensive income for financial liabilities that are measured at fair value in accordance with the fair value options for financial instruments; and will clarify that a deferred asset related to available-for-sale securities should be included in an entity's evaluation for a valuation allowance. The provisions of ASU No. 2016-01 are effective for us as of January 1, 2018. We are currently assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, "Leases." The ASU sets out the principles for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors. The ASU requires lessees to adopt a right-of-use asset approach that will bring substantially all leases onto the balance sheet, with the exception of short-term leases. The subsequent accounting for this right-of-use asset will be based on a dual-model approach, under which the lease will be classified as either a finance or an operating lease. The lessor accounting model under this ASU is similar to current guidance, but certain underlying principles in the lessor model have been aligned with the new revenue recognition standard. The provisions of ASU No. 2016-02 are effective for us as of January 1, 2019, are required to be applied on a modified retrospective approach and early adoption is permitted. We are currently assessing the impact to our 5,800 lessor leases and other lessee leases, if any, that the adoption of this ASU will have on our consolidated financial statements. Additionally, this ASU will limit the capitalization associated with leasing commissions, primarily internally-generated lease commissions, of which we capitalized internal costs of $7.2 million during the year ended December 31, 2016. In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments." This ASU amends prior guidance on the impairment of financial instruments, and adds an impairment model that is based on expected losses rather than incurred losses with the recognition of an allowance based on an estimate of expected credit losses. The provisions of ASU No. 2016-13 are effective for us as of January 1, 2020, and early adoption is permitted for fiscal years beginning after December 15, 2018. We are currently assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments." This ASU amends guidance to either add or clarify the classification of certain cash receipts and payments in the statement of cash flows. Eight specific issues were identified for further clarification and include: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of company-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions and the classification of cash flows that have aspects of more than one class of cash flows. The provisions of ASU No. 2016-15 are effective for us as of January 1, 2018 on a retrospective basis, 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 October 2016, the FASB issued ASU No. 2016-17, "Interests Held through Related Parties That Are Under Common Control." This ASU amends the consolidation guidance on how a reporting entity that is a single decision maker of a VIE should treat indirect interests in the entity held through related parties that are under common control when determining whether it is the primary beneficiary of that VIE. The provisions of ASU No. 2016-17 were effective for us as of January 1, 2017 on a retrospective basis, and early adoption was permitted. We believe the adoption of this ASU will not have a material impact to our consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, "Restricted Cash." This ASU amends prior guidance on restricted cash presentation and requires that restricted cash and restricted cash equivalents be included in the statement of cash flows. Changes in restricted cash and restricted cash equivalent that results from transfers between different cash categories should not be presented as cash flow activities in the statement of cash flow. The ASU also requires an entity to disclose information about the nature of restricted cash, as well as a reconciliation between the statement of financial position and the statement of cash flow when the statement of financial position has more than one line item for cash, cash equivalent, restricted cash and restricted cash equivalent. The provisions of ASU No. 2016-18 are effective for us as of January 1, 2018 on a retrospective basis, 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, including early adoption. In January 2017, the FASB issued ASU No. 2017-01, "Business Combinations." This ASU narrows the definition of a business and provides a framework for evaluating whether a transaction is an acquisition of a business or an asset. The amendment provides a screen to evaluate whether a transaction is a business and requires that when substantially all of the fair value of the acquired assets be concentrated in a single asset or identifiable group of similar assets that the assets acquired are not a business. If the screen is not met, then to be considered a business, the assets must have an input and a substantive process to create outputs. The provisions of ASU No. 2017-01 are effective for us as of January 1, 2018, and early adoption is permitted. We have adopted this ASU as of January 1, 2017. Upon adoption, we expect a reduction in the number of our future acquisitions to be considered a business combination, which would reduce the amount of disclosures in our consolidated financial statements. Upon adoption, certain acquisition costs that were previously expensed may be capitalized. During the year ended December 31, 2016, we incurred acquisition costs of $1.4 million.

Newly Issued Accounting Pronouncements

Adopted

In April 2014, the FASB issued 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 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 early adopted this update effective January 1, 2016, and the adoption did not have any impact to 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 were effective for us as of January 1, 2016. Upon adoption of this update, we have reported 10 additional entities as VIEs, since the limited partners in these entities do not have either substantive kick-out or participating rights. The adoption expanded our VIE disclosures for these 10 entities, but had no impact to our consolidated balance sheets or consolidated statements of operations or cash flows as the consolidation status of these entities did not change. Retrospective disclosures associated with our VIEs were made to conform to the current year presentation.

In September 2015, the FASB issued ASU No. 2015-16, "Simplifying the Accounting for Measurement-Period Adjustments." This ASU allows measurement-period adjustments associated with business combinations recorded in the reporting period in which the adjustment amounts are determined, rather than retrospectively, as if the accounting for the business combination had been completed as of the acquisition date. The provisions of ASU No. 2015-16 were effective for us as of January 1, 2016. We have adopted this update, and the adoption did not have have any impact to our consolidated financial statements.

Not Yet Adopted

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, as amended in subsequently issued amendments, are effective for us on January 1, 2018, and are required to be applied either on a retrospective or a modified retrospective approach. In anticipation of adopting this ASU, we have formed a team to determine the elements of the ASU that impact our contracts. As each sale contract is unique in our industry, many of the contracts will have to be re-reviewed. We are assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements, which may include the timing related to sales recognition on real estate. Also, we are evaluating whether we will adopt on a retrospective basis or modified retrospective basis.

In January 2016, the FASB issued ASU No. 2016-01, "Recognition and Measurement of Financial Assets and Financial Liabilities." This ASU will require equity investments, excluding those investments accounted for under the equity method of accounting or those that result in consolidation of the investee, to be measured at fair value with the changes in fair value recognized in net income; will simplify the impairment assessment of those investments; will eliminate the disclosure of the method(s) and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost and change the fair value calculation for those investments; will change the disclosure in other comprehensive income for financial liabilities that are measured at fair value in accordance with the fair value options for financial instruments; and will clarify that a deferred asset related to available-for-sale securities should be included in an entity's evaluation for a valuation allowance. The provisions of ASU No. 2016-01 are effective for us as of January 1, 2018. We are currently assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, "Leases." The ASU sets out the principles for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors. The ASU requires lessees to adopt a right-of-use asset approach that will bring substantially all leases onto the balance sheet, with the exception of short-term leases. The subsequent accounting for this right-of-use asset will be based on a dual-model approach, under which the lease will be classified as either a finance or an operating lease. The lessor accounting model under this ASU is similar to current guidance, but certain underlying principles in the lessor model have been aligned with the new revenue recognition standard. The provisions of ASU No. 2016-02 are effective for us as of January 1, 2019, are required to be applied on a modified retrospective approach and early adoption is permitted. We are currently assessing the impact to our 5,800 lessor leases and other lessee leases, if any, that the adoption of this ASU will have on our consolidated financial statements. Additionally, this ASU will limit the capitalization associated with leasing commissions, primarily internally-generated lease commissions, of which we capitalized internal costs of $7.2 million during the year ended December 31, 2016.

In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments." This ASU amends prior guidance on the impairment of financial instruments, and adds an impairment model that is based on expected losses rather than incurred losses with the recognition of an allowance based on an estimate of expected credit losses. The provisions of ASU No. 2016-13 are effective for us as of January 1, 2020, and early adoption is permitted for fiscal years beginning after December 15, 2018. We are currently assessing the impact, if any, that the adoption of this ASU will have on our consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments." This ASU amends guidance to either add or clarify the classification of certain cash receipts and payments in the statement of cash flows. Eight specific issues were identified for further clarification and include: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of company-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions and the classification of cash flows that have aspects of more than one class of cash flows. The provisions of ASU No. 2016-15 are effective for us as of January 1, 2018 on a retrospective basis, 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 October 2016, the FASB issued ASU No. 2016-17, "Interests Held through Related Parties That Are Under Common Control." This ASU amends the consolidation guidance on how a reporting entity that is a single decision maker of a VIE should treat indirect interests in the entity held through related parties that are under common control when determining whether it is the primary beneficiary of that VIE. The provisions of ASU No. 2016-17 were effective for us as of January 1, 2017 on a retrospective basis, and early adoption was permitted. We believe the adoption of this ASU will not have a material impact to our consolidated financial statements.

In November 2016, the FASB issued ASU No. 2016-18, "Restricted Cash." This ASU amends prior guidance on restricted cash presentation and requires that restricted cash and restricted cash equivalents be included in the statement of cash flows. Changes in restricted cash and restricted cash equivalent that results from transfers between different cash categories should not be presented as cash flow activities in the statement of cash flow. The ASU also requires an entity to disclose information about the nature of restricted cash, as well as a reconciliation between the statement of financial position and the statement of cash flow when the statement of financial position has more than one line item for cash, cash equivalent, restricted cash and restricted cash equivalent. The provisions of ASU No. 2016-18 are effective for us as of January 1, 2018 on a retrospective basis, 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, including early adoption.

In January 2017, the FASB issued ASU No. 2017-01, "Business Combinations." This ASU narrows the definition of a business and provides a framework for evaluating whether a transaction is an acquisition of a business or an asset. The amendment provides a screen to evaluate whether a transaction is a business and requires that when substantially all of the fair value of the acquired assets be concentrated in a single asset or identifiable group of similar assets that the assets acquired are not a business. If the screen is not met, then to be considered a business, the assets must have an input and a substantive process to create outputs. The provisions of ASU No. 2017-01 are effective for us as of January 1, 2018, and early adoption is permitted. We have adopted this ASU as of January 1, 2017. Upon adoption, we expect a reduction in the number of our future acquisitions to be considered a business combination, which would reduce the amount of disclosures in our consolidated financial statements. Upon adoption, certain acquisition costs that were previously expensed may be capitalized. During the year ended December 31, 2016, we incurred acquisition costs of $1.4 million.