Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets [Abstract]

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Transactions with Norfolk Southern Railway Company (Allocation of Estimated Fair Values of Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 01, 2019	Dec. 31, 2018
Intangible assets:
Total assets	$ 6,676,672		$ 4,146,296
1200 Peachtree
Tangible assets:
Land and improvements		$ 19,495
Building		62,836
Tangible assets		82,331
Intangible assets:
In-place leases		9,969
Intangible assets		9,969
Total assets		$ 92,300