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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage after initial performance period (in years)       50.00%  
Risk-free rate (as a percent)       1.47%  
Dividend yield (as a percent)       2.30%  
The Company          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected volatility rate (as a percent)       24.00%  
SNL Equity REIT Index          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected volatility rate (as a percent)       17.00%  
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 (as a percent) 25.00%     25.00%  
Outperformance Program          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum bonus pool   $ 20,000,000.0   $ 20,000,000.0  
Mandatory holding period (in years)       2 years  
Outperformance Program | 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   4,105,000 $ 3,407,000 $ 8,206,000 $ 6,831,000
Outperformance Program | General and administrative expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   3,886,000 3,301,000 7,788,000 6,643,000
Outperformance Program | Deferred leasing costs and lease intangibles, net and tenant improvements          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 219,000 $ 106,000 $ 418,000 $ 188,000
Outperformance Program | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)       2 years  
Outperformance Plan Prior To 2017          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period (in years)       3 years