Recent Accounting Pronouncements (Policies)	9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]
Recent Accounting Pronouncements	In February 2016, the FASB issued ASU No. 2016-02 - Leases (Topic 842), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). The guidance amended the existing accounting standards, including the requirement that lessees recognize right-of-use assets and lease liabilities for leases with terms greater than twelve months on their condensed consolidated balance sheet. It also requires disclosures designed to give financial statement users information regarding amount, timing, and uncertainty of cash flows arising from leases. The FASB issued ASU 2018-11, "Leases (Topic 842) Targeted Improvements" in July 2018, which provides lessors with a practical expedient, by class of underlying assets, to not separate non-lease components from the related lease components, and, instead, to account for those components as a single lease component, if certain criteria are met. We adopted Topic 842 on January 1, 2019, the date it became effective for public companies, and applied the new leasing standard to leases in place as of the effective date using the modified retrospective transition method. We applied Topic 842 to all leases as of January 1, 2019 with comparative periods continuing to be reported under Topic 840. We elected the package of practical expedients and were not required to reassess the following upon adoption: (i) whether an expired or existing contract met the definition of a lease; (ii) the lease classification at January 1, 2019 for existing leases; and (iii) whether leasing costs previously capitalized as initial direct costs would continue to be amortized. This allowed us to continue to account for our existing ground and office space leases as operating leases. Upon adoption, we did not have an adjustment to the opening balance of retained earnings due to the election of these practical expedients. The package of practical expedients provided to lessors allowed us not to separate expenses reimbursed by our customers (“rental recoveries”) from the associated rental revenue if certain criteria were met. We assessed these criteria and concluded that the timing and pattern of transfer for rental revenue and the associated rental recoveries are the same and, as our leases qualify as operating leases, we accounted for and presented rental revenue and rental recoveries (UHS facilities and Non-related parties) as a single component under Lease revenue in our condensed consolidated statements of income for the three and nine months ended September 30, 2019 and 2018. Upon adoption, we recognized right-of-use assets and lease liabilities for ground leases in which we are the lessee with various third parties, including subsidiaries of UHS, at fourteen of our consolidated properties on the condensed consolidated balance sheet. See Note 7 for further disclosure around our adoption of the new lease standard. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses," which introduced new guidance for an approach based on expected losses to estimate credit losses on certain types of financial instruments. Instruments in scope include loans, held-to-maturity debt securities, and net investments in leases as well as reinsurance and trade receivables. In November 2018, the FASB issued ASU 2018-19, which clarifies that operating lease receivables are outside the scope of the new standard. The standard will be effective for us in fiscal years beginning after December 15, 2019. We are currently evaluating the impact that the adoption of the new standard will have on our consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" and subsequent related updates. The amendments in this update expand and refine hedge accounting for both non-financial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The ASU amends the presentation and disclosure requirements and changes how entities assess effectiveness. The ASU eliminates the requirement to separately measure and report hedge ineffectiveness and requires all items that affect earnings be presented in the same income statement line as the hedged items. The amendments in this guidance permit the use of the Overnight Index Swap rate based on Secured Overnight Financing Rate (SOFR) as a U.S. benchmark interest rate for hedge accounting purposes to facilitate the LIBOR to SOFR transition. This guidance was effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and we adopted effective January 1, 2019. The amended presentation and disclosure guidance was required only prospectively. The adoption of this guidance did not have a material impact on our consolidated financial statements.

Recent Accounting Pronouncements (Policies)

9 Months Ended

Sep. 30, 2019

In February 2016, the FASB issued ASU No. 2016-02 - Leases (Topic 842), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). The guidance amended the existing accounting standards, including the requirement that lessees recognize right-of-use assets and lease liabilities for leases with terms greater than twelve months on their condensed consolidated balance sheet. It also requires disclosures designed to give financial statement users information regarding amount, timing, and uncertainty of cash flows arising from leases. The FASB issued ASU 2018-11, "Leases (Topic 842) Targeted Improvements" in July 2018, which provides lessors with a practical expedient, by class of underlying assets, to not separate non-lease components from the related lease components, and, instead, to account for those components as a single lease component, if certain criteria are met.

We adopted Topic 842 on January 1, 2019, the date it became effective for public companies, and applied the new leasing standard to leases in place as of the effective date using the modified retrospective transition method. We applied Topic 842 to all leases as of January 1, 2019 with comparative periods continuing to be reported under Topic 840. We elected the package of practical expedients and were not required to reassess the following upon adoption: (i) whether an expired or existing contract met the definition of a lease; (ii) the lease classification at January 1, 2019 for existing leases; and (iii) whether leasing costs previously capitalized as initial direct costs would continue to be amortized. This allowed us to continue to account for our existing ground and office space leases as operating leases. Upon adoption, we did not have an adjustment to the opening balance of retained earnings due to the election of these practical expedients. The package of practical expedients provided to lessors allowed us not to separate expenses reimbursed by our customers (“rental recoveries”) from the associated rental revenue if certain criteria were met. We assessed these criteria and concluded that the timing and pattern of transfer for rental revenue and the associated rental recoveries are the same and, as our leases qualify as operating leases, we accounted for and presented rental revenue and rental recoveries (UHS facilities and Non-related parties) as a single component under Lease revenue in our condensed consolidated statements of income for the three and nine months ended September 30, 2019 and 2018. Upon adoption, we recognized right-of-use assets and lease liabilities for ground leases in which we are the lessee with various third parties, including subsidiaries of UHS, at fourteen of our consolidated properties on the condensed consolidated balance sheet.

See Note 7 for further disclosure around our adoption of the new lease standard.

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses," which introduced new guidance for an approach based on expected losses to estimate credit losses on certain types of financial instruments. Instruments in scope include loans, held-to-maturity debt securities, and net investments in leases as well as reinsurance and trade receivables. In November 2018, the FASB issued ASU 2018-19, which clarifies that operating lease receivables are outside the scope of the new standard. The standard will be effective for us in fiscal years beginning after December 15, 2019. We are currently evaluating the impact that the adoption of the new standard will have on our consolidated financial statements.

In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" and subsequent related updates. The amendments in this update expand and refine hedge accounting for both non-financial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The ASU amends the presentation and disclosure requirements and changes how entities assess effectiveness. The ASU eliminates the requirement to separately measure and report hedge ineffectiveness and requires all items that affect earnings be presented in the same income statement line as the hedged items. The amendments in this guidance permit the use of the Overnight Index Swap rate based on Secured Overnight Financing Rate (SOFR) as a U.S. benchmark interest rate for hedge accounting purposes to facilitate the LIBOR to SOFR transition. This guidance was effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and we adopted effective January 1, 2019. The amended presentation and disclosure guidance was required only prospectively. The adoption of this guidance did not have a material impact on our consolidated financial statements.