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Debt - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 17, 2019
Feb. 25, 2020
USD ($)
Jan. 31, 2020
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mortgages and Line of Credit Facility [Line Items]              
Loss on extinguishment of debt       $ 4,500 $ 5,805 $ 5,153 $ 701
Payment for Debt Extinguishment or Debt Prepayment Cost         2,900    
Proceeds from Notes Payable         2,200 118,141 $ 366,239
Derivative Entered Into, Notional Value           381,300  
Mortgages payable              
Mortgages and Line of Credit Facility [Line Items]              
Net carrying value of real estate collateralizing the mortgages payable         1,400,000 2,300,000  
Repayments of Secured Debt         709,100 298,100  
Derivative, Loss on Derivative         2,900    
Proceeds from Notes Payable           118,100  
Derivative, notional amount         867,600 1,300,000  
Long-term Debt         1,125,777 1,838,381  
Line of credit              
Mortgages and Line of Credit Facility [Line Items]              
Credit facility, maximum borrowing capacity         1,400,000    
Line of credit | Revolving credit facility              
Mortgages and Line of Credit Facility [Line Items]              
Credit facility, maximum borrowing capacity         1,000,000    
Long-term Debt         $ 200,000 0  
Debt Instrument, Number Of Term Extension Options         2    
Line of credit | Tranche A-1 Term Loan              
Mortgages and Line of Credit Facility [Line Items]              
Derivative, notional amount         $ 100,000 $ 100,000  
Debt Instrument, Interest Rate During Period         2.12% 2.12%  
Credit facility, maximum borrowing capacity         $ 200,000    
Line of credit | Tranche A-2 Term Loan              
Mortgages and Line of Credit Facility [Line Items]              
Derivative, notional amount         $ 137,600    
Debt Instrument, Interest Rate During Period         2.59%    
Credit facility, maximum borrowing capacity         $ 200,000    
London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Tranche A-2 Term Loan              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate, Reduction 40.00%            
Other Expense [Member]              
Mortgages and Line of Credit Facility [Line Items]              
Loss on extinguishment of debt         $ (5,800)    
Minimum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Revolving credit facility              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         1.10%    
Minimum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Tranche A-1 Term Loan              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         1.20%    
Minimum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Tranche A-2 Term Loan              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         1.15%    
Maximum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Revolving credit facility              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         1.50%    
Maximum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Tranche A-1 Term Loan              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         1.70%    
Maximum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Tranche A-2 Term Loan              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         1.70%    
Subsequent Event [Member] | Minimum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Revolving credit facility              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate     1.05%        
Subsequent Event [Member] | Maximum | London Interbank Offered Rate (LIBOR) [Member] | Line of credit | Revolving credit facility              
Mortgages and Line of Credit Facility [Line Items]              
Debt Instrument, Basis Spread on Variable Rate     1.50%        
4747 Bethesda Avenue [Member] | Subsequent Event [Member] | Mortgages payable              
Mortgages and Line of Credit Facility [Line Items]              
Proceeds from Notes Payable   $ 175,000          
1730 M Street [Member] | Mortgages payable              
Mortgages and Line of Credit Facility [Line Items]              
Proceeds from Notes Payable           $ 47,500  
Central Place Tower [Member] | Mortgages payable              
Mortgages and Line of Credit Facility [Line Items]              
Derivative, notional amount         $ 220,000