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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period (in years)   3 years  
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%  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years)   2 years  
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  
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   $ 4,101,000 $ 3,424,000
Outperformance Program | General and administrative expenses      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense   3,902,000 3,342,000
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   $ 199,000 $ 82,000