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Stock-Based Compensation (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free rate				2.57%
Dividend yield				3.00%
Additional paid-in capital and non-controlling interest—units in the operating partnership
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 5,102,000	$ 4,577,000	$ 10,281,000	$ 9,147,000
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		5,067,000	4,289,000	10,217,000	8,627,000
Deferred leasing costs and lease intangibles assets, net
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		35,000	$ 288,000	$ 64,000	$ 520,000
The Company
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate				22.00%
Particular REIT Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate				18.00%
Existing and Newly Elected Board Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Employees | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	4 years
One-Time Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights	25.00%			50.00%
Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)				3 years
Outperformance Plan Prior To 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage after initial performance period (in years)				50.00%
Outperformance Plan Prior To 2017 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period following performance period				2 years
Award mandatory holding period				2 years
Outperformance Program 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum bonus pool		$ 28,000,000.0		$ 28,000,000.0

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Percentage of vesting of award under share-based payment arrangement.

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