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Stock-Based Compensation (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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		$ 4,574,000	$ 3,666,000	$ 13,721,000	$ 11,872,000
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		4,292,000	3,449,000	12,919,000	11,237,000
Deferred leasing costs and lease intangibles assets, net
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		282,000	$ 217,000	$ 802,000	$ 635,000
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%			25.00%
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, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum bonus pool		$ 25,000,000.0		$ 25,000,000.0
TSR, absolute hurdle rate		21.00%		21.00%
TSR, annualized hurdle rate		7.00%		7.00%
TSR, maximum reduction percentage				75.00%
Risk-free rate				2.37%
Dividend yield				2.90%
Outperformance Program, 2017 | The Company
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate				20.00%
Outperformance Program, 2017 | Particular REIT Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate				18.00%

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of share-based compensation awards.

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