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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
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   $ 3,666,000 $ 3,400,000 $ 11,872,000 $ 10,231,000
General and administrative expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   3,449,000 3,288,000 11,237,000 9,931,000
Deferred leasing costs and lease intangibles assets, net          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   217,000 $ 112,000 $ 635,000 $ 300,000
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  
Outperformance Program, 2017          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum bonus pool   $ 20,000,000   $ 20,000,000  
Mandatory holding period (in years)       2 years  
Risk-free rate       1.47%  
Dividend yield       2.30%  
Outperformance Program, 2017 | The Company          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected volatility rate       24.00%  
Outperformance Program, 2017 | Particular REIT Index          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected volatility rate       17.00%