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Share-Based Payments - Formation Awards (Details) - USD ($)
12 Months Ended
Jul. 18, 2017
Dec. 31, 2018
Dec. 31, 2017
Jul. 17, 2017
Compensation expense recognition period (in years)   2 years 9 months    
Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   93,784    
Price per share/unit (2)   $ 34.40    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   10 years    
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued   $ 725,000 $ 23,700,000  
Compensation expense recognition period (in years)   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   2,655,394 2,673,814  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 8.81 $ 8.84  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 7.73    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (39,970)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 8.32    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (72,234)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value   $ 8.84    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 333,000    
Formation Awards [Member] | JBG Companies [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,700,000      
Stock Granted, Value, Share-based Compensation, Gross $ 100,000,000 $ 3,200,000    
Price per share/unit (2) $ 37.10      
Measurement Input, Price Volatility [Member] | Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     26.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum   27.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     2.30%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     2.30%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   7 years 7 years  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum   29.00%    
Measurement Input, Risk Free Interest Rate [Member] | Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum   2.80%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum   3.00%    
Omnibus Share Plan, 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   4,800,000   10,300,000
Maximum | Measurement Input, Expected Dividend Rate [Member] | Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   2.70%    
Minimum | Measurement Input, Expected Dividend Rate [Member] | Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   2.50%    
Share-based Compensation Award, Tranche One [Member] | Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%    
Share-based Compensation Award, Tranche One [Member] | Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%    
Share-based Compensation Award, Tranche Three [Member] | Formation Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   50.00%