Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Accounting and Presentation	The accompanying unaudited consolidated financial statements of the Company are prepared by management on the accrual basis of accounting and in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information as contained in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”), and in conjunction with rules and regulations of the SEC. Certain information and footnote disclosures required for annual financial statements have been condensed or excluded pursuant to SEC rules and regulations. Accordingly, the unaudited consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. The unaudited consolidated financial statements include accounts and related adjustments, which are, in the opinion of management, of a normal recurring nature and necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the interim period. Operating results for the three and six months ended June 30, 2019 are not necessarily indicative of the results that may be expected for the year ending December 31, 2019. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.
Consolidation	The consolidated financial statements of the Company include all accounts of the Company, the Current Operating Partnership, and its subsidiaries. Intercompany transactions are not shown on the consolidated statements. However, each property owning entity is a wholly-owned subsidiary which is a special purpose entity ("SPE"), whose assets and credit are not available to satisfy the debts or obligations of any other entity, except to the extent required with respect to any co-borrower or guarantor under the same credit facility.
Use of Estimates	Use of Estimates The preparation of the unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the unaudited consolidated financial statements and accompanying notes. Actual results could materially differ from those estimates.
Per Share Data	Per Share Data The Company reports earnings per share for the period as (1) basic earnings per share computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding during the period, and (2) diluted earnings per share computed by dividing net income (loss) attributable to common stockholders by the weighted average number of common shares outstanding, including common stock equivalents.
Segment Information	Segment Information ASC Topic 280, Segment Reporting, establishes standards for reporting financial and descriptive information about a public entity’s reportable segments. The Company internally evaluates all of the properties and interests therein as one reportable segment.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements On February 25, 2016, the FASB issued ASU 2016-02, Leases ("ASU 2016-02"), which sets out the principals for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors. ASU 2016-02 was subsequently amended by the following updates: (i) ASU 2018-10, Leases: Codification Improvements to Topic 842, (ii) ASU 2018-11, Leases: Targeted Improvements, (iii) ASU 2018-20, Leases: Narrow Scope Improvements for Lessors and (iv) ASU 2019-01, Leases: Codification Improvements (collectively referred to as “ASC 842”). ASC 842 supersedes prior lease accounting guidance contained in ASC 840, Leases (“ASC 840”). On January 1, 2019, the Company adopted ASC 842 using the modified retrospective approach and elected to apply the provisions as of the date of adoption on a prospective basis. In making this election, the Company has continued to apply ASC 840 to comparative periods, including providing disclosures required by ASC 840 for these periods, and the Company recognized the effects of applying ASC 842 as a cumulative-effect adjustment to retained earnings as of January 1, 2019, as described below under “Lessor”. Upon adoption of ASC 842, the Company elected the “package of practical expedients” which allowed the Company to not reassess (a) whether expired or existing contracts as of January 1, 2019 are or contain leases, (b) the lease classification for any expired or existing leases as of January 1, 2019, and (c) the treatment of initial direct costs relating to any existing leases as of January 1, 2019. The package of practical expedients was made as a single election and was consistently applied to all leases that commenced before January 1, 2019. Lessor ASC 842 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. As the Company elected the package of practical expedients, the Company's existing leases as of January 1, 2019 continue to be accounted for as operating leases. Upon adoption of ASC 842, the Company elected the practical expedient permitting lessors to elect by class of underlying asset to not separate nonlease components (for example, maintenance services, including common area maintenance) from associated lease components (the “non-separation practical expedient”) if both of the following criteria are met: (1) the timing and pattern of transfer of the lease and non-lease component(s) are the same and (2) the lease component would be classified as an operating lease if it were accounted for separately. If both criteria are met, the combined component is accounted for in accordance with ASC 842 if the lease component is the predominant component of the combined component; otherwise, the combined component is accounted for in accordance with the revenue recognition standard. The Company assessed the criteria above with respect to the Company's operating leases and determined that they qualify for the non-separation practical expedient. As a result, the Company has accounted for and presented all rental income earned pursuant to operating leases, including property expense recovery, as a single line item “Rental income” in the consolidated statement of operations for the three and six months ended June 30, 2019. Prior to the adoption of ASC 842, the Company presented rental income, property expense recovery and other income related to leases separately in the Company's consolidated statements of operations. For comparability, the Company adjusted the comparative consolidated statement of operations for the three and six months ended June 30, 2018 to conform to the 2019 financial statement presentation. Under ASC 842, lessors are required to record revenues and expenses on a gross basis for lessor costs (which include real estate taxes) when these costs are reimbursed by a lessee. Conversely, lessors are required to record revenues and expenses on a net basis for lessor costs when they are paid by a lessee directly to a third party on behalf of the lessor. Prior to the adoption of ASC 842, the Company recorded revenues and expenses on a gross basis for real estate taxes whether they were reimbursed to the Company by a tenant or paid directly by a tenant to the taxing authorities on the Company's behalf. Effective January 1, 2019, the Company is recording these costs in accordance with ASC 842. Lessee ASC 842 requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset (“ROU asset”), which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. ASC 842 also requires lessees to classify leases as either finance or operating leases based on whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification is used to evaluate whether the lease expense should be recognized based on an effective interest method or on a straight-line basis over the term of the lease. The Company is the lessee on two ground lease and one office space lease, which were classified as operating leases under ASC 840. As the Company elected the packages of practical expedients, the Company is not required to reassess the classification of these existing leases and as such, these leases continue to be accounted for as operating leases. In the event the Company modifies existing leases or enters into new leases in the future, such leases may be classified as finance leases. On January 1, 2019, the Company recognized ROU assets and lease liabilities for these leases on the Company's consolidated balance sheets, and on a go-forward basis, lease expense will be recognized on a straight-line basis over the remaining term of the lease. On January 1, 2019, the Company recorded a ROU asset of $28.4 million and a corresponding liability relating to the Company's existing ground lease arrangements and wrote-off approximately $2.4 million in deferred rent, included primarily in "Other (loss) income, net" in the consolidated statements of operations. These operating leases were recognized based on the present value of the future minimum lease payments over the lease term. As these leases do not provide an implicit rate, the Company used its incremental borrowing rate based on the information available in determining the present value of future payments. The discount rates used to determine the present value of these operating leases’ future payments were 3.94% and 5.36%. Upon adoption of ASC 842, the Company also elected the practical expedient to not separate non-lease components, such as common area maintenance, from associated lease components for the Company's ground and office space leases.