Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]
Unaudited Interim Condensed Consolidated Financial Statements	Unaudited Interim Condensed Consolidated Financial Statements: The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. for interim financial information, including rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement have been included. Operating results for the three and nine months ended September 30, 2019, are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the U.S. for complete financial statements. For information about significant accounting policies, refer to the consolidated financial statements and footnotes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018. There have been no material changes to these significant accounting policies other than the following: On January 1, 2019, we adopted Accounting Standards Update (“ASU”) 2016-02, “Leases”, (“ASU 2016-02”). ASU 2016-02 sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). We adopted this standard using the modified retrospective approach and have elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, permits the following: no reassessment of whether existing contracts are or contain a lease; no reassessment of lease classification for existing leases; and no reassessment of initial direct costs for existing leases. Additionally, we made certain elections permitted in accordance with ASU 2018-11, “Leases (Topic 842): – Targeted Improvements.” which (1) permits entities to apply the transition provisions of the new standard at its adoption date instead of at the earliest comparative period presented in its financial statements and (2) permits lessors to account for lease and non-lease components as a single lease component in a contract if certain criteria are met. The standard requires lessees to apply a dual approach, classifying leases as either financing or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method (for finance leases) or on a straight-line basis (for operating leases) over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term greater than 12 months regardless of their classification. Leases with a term of 12 months or less will remain off balance sheet with lease expense recognized on a straight-line basis over the lease term, similar to previous guidance for operating leases. The standard requires lessors to account for leases using an approach that is substantially equivalent to previous guidance for sales-type leases, direct financing leases and operating leases. For our leases in which we are the lessee, including ground leases on which certain of our facilities reside, along with corporate office and equipment leases, we recorded a right-of-use asset and offsetting lease liability of approximately $84 million upon adoption of this standard – resulting in no material cumulative effect adjustment. From a lessor perspective, we did not change the classification or accounting of our existing leases except, we are now grossing up our income statement for certain operating expenses, such as property taxes and insurance, that the tenants of our facilities are required to reimburse us for pursuant to our “triple-net” leases.
Recent Accounting Developments	Recent Accounting Developments: Measurement of Credit Losses on Financial Instruments In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"). This standard requires a new forward-looking “expected loss” model to be used for our financing receivables, including direct financing leases, investments in sale leaseback transactions, and loan receivables, which the FASB believes will result in more timely recognition of such losses. ASU 2016-13 is effective for us beginning January 1, 2020. We are still evaluating the impact of this standard, but we do not believe such impact will be material.
Reclassifications	Reclassifications Certain amounts in the consolidated financial statements for prior periods have been reclassified to conform to the current period presentation.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2019

Unaudited Interim Condensed Consolidated Financial Statements

Unaudited Interim Condensed Consolidated Financial Statements: The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. for interim financial information, including rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair statement have been included. Operating results for the three and nine months ended September 30, 2019, are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the U.S. for complete financial statements.

For information about significant accounting policies, refer to the consolidated financial statements and footnotes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018. There have been no material changes to these significant accounting policies other than the following:

On January 1, 2019, we adopted Accounting Standards Update (“ASU”) 2016-02, “Leases”, (“ASU 2016-02”). ASU 2016-02 sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). We adopted this standard using the modified retrospective approach and have elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, permits the following: no reassessment of whether existing contracts are or contain a lease; no reassessment of lease classification for existing leases; and no reassessment of initial direct costs for existing leases. Additionally, we made certain elections permitted in accordance with ASU 2018-11, “Leases (Topic 842): – Targeted Improvements.” which (1) permits entities to apply the transition provisions of the new standard at its adoption date instead of at the earliest comparative period presented in its financial statements and (2) permits lessors to account for lease and non-lease components as a single lease component in a contract if certain criteria are met.

The standard requires lessees to apply a dual approach, classifying leases as either financing or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method (for finance leases) or on a straight-line basis (for operating leases) over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term greater than 12 months regardless of their classification. Leases with a term of 12 months or less will remain off balance sheet with lease expense recognized on a straight-line basis over the lease term, similar to previous guidance for operating leases. The standard requires lessors to account for leases using an approach that is substantially equivalent to previous guidance for sales-type leases, direct financing leases and operating leases.

For our leases in which we are the lessee, including ground leases on which certain of our facilities reside, along with corporate office and equipment leases, we recorded a right-of-use asset and offsetting lease liability of approximately $84 million upon adoption of this standard – resulting in no material cumulative effect adjustment. From a lessor perspective, we did not change the classification or accounting of our existing leases except, we are now grossing up our income statement for certain operating expenses, such as property taxes and insurance, that the tenants of our facilities are required to reimburse us for pursuant to our “triple-net” leases.

Recent Accounting Developments

Recent Accounting Developments:

Measurement of Credit Losses on Financial Instruments

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"). This standard requires a new forward-looking “expected loss” model to be used for our financing receivables, including direct financing leases, investments in sale leaseback transactions, and loan receivables, which the FASB believes will result in more timely recognition of such losses. ASU 2016-13 is effective for us beginning January 1, 2020. We are still evaluating the impact of this standard, but we do not believe such impact will be material.

Reclassifications

Certain amounts in the consolidated financial statements for prior periods have been reclassified to conform to the current period presentation.