Compensation Costs, Leasing and Construction Activities

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- Definition

Percent Of Revenues

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No definition available.

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- Definition

Short Term Investment Considered Cash And Cash Equivalents Maturity Period

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No definition available.

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- Definition

Summary Of Significant Accounting Policies [Line Items]

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No definition available.

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- Definition

The amount as of the balance sheet date by which cumulative distributions to shareholders (or partners) exceed retained earnings (or accumulated earnings).

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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- Definition

Amount of interest capitalized during the period.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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No definition available.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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- Definition

Amount of unrecognized tax benefits.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Period in which short-term investment become cash equivalents	90 days
Interest capitalized	$ 10,900,000	$ 7,400,000
Compensation costs, leasing and construction activities	10,700,000	10,100,000
Unrecognized tax benefits	0		$ 0
Income tax penalties and interest expense	$ 0	0
Gross proceeds		139,300,000
Gain on sale of property		39,400,000
Number of reportable segments \| segment	1
Total operating revenues	$ 814,515,000	$ 744,368,000
Net investments in real estate	15,542,054,000		$ 15,079,726,000
Ascenty Acquisition
Summary Of Significant Accounting Policies [Line Items]
Net investments in real estate	$ 362,951,000
Total long-lived assets
Summary Of Significant Accounting Policies [Line Items]
Concentration risk			10.90%
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized from applying Topic 840	99.00%	97.00%
Accumulated dividends in excess of earnings	$ 6,300,000
ASU 2014-09
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized from applying Topic 840	1.00%	3.00%
Outside the United States
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues	$ 179,100,000	$ 140,900,000
Net investments in real estate	3,500,000,000		$ 3,800,000,000
United States
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues	635,400,000	603,500,000
Net investments in real estate	11,100,000,000		11,100,000,000
United Kingdom
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues	73,300,000	$ 75,200,000
Net investments in real estate	$ 1,700,000,000		$ 1,600,000,000
Geographic Concentration Risk \| Sales
Summary Of Significant Accounting Policies [Line Items]
Concentration risk	9.00%	10.10%
Geographic Concentration Risk \| Total long-lived assets
Summary Of Significant Accounting Policies [Line Items]
Concentration risk	11.50%