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Indebtedness - Narrative Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Jan. 20, 2020
USD ($)
Jul. 15, 2019
USD ($)
Feb. 11, 2019
USD ($)
Jan. 31, 2020
USD ($)
Feb. 11, 2019
Mar. 31, 2019
USD ($)
Aug. 23, 2019
Dec. 31, 2019
USD ($)
building
extension_option
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 19, 2020
USD ($)
Mar. 01, 2019
property
Debt Instrument [Line Items]                        
Principal of properties collateralized               $ 326,209        
Number of properties, securing mortgage | property                       1
Unsecured revolving credit facility               0 $ 175,000      
Loss on early extinguishment of debt               $ (769) (709) $ (1,715)    
Extinguishment of debt, amount           $ 7,890            
Number of buildings collateralized | building               11        
Book value of properties collateralized               $ 597,619        
Long-term debt               2,340,453 $ 3,254,890      
Unsecured Debt Loan in 2020                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity               $ 300        
Weighted average annual interest rate             3.90%   3.40% 2.50%    
Senior unsecured notes, 3.60% interest rate, due in 2020                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)               3.60%        
Unsecured Debt | Unsecured term loan, due in 2022                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity               $ 250        
Weighted average annual interest rate         4.30%       3.80% 2.90%    
Repayments of debt     $ 88,000                  
Loss on early extinguishment of debt               $ 643        
Senior Unsecured Notes | 3.750% Senior Unsecured Notes Due In 2019                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)                 3.75%      
Repayments of debt   $ 350                    
Senior Unsecured Notes | Senior unsecured notes, 3.60% interest rate, due in 2020                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)               3.60%        
SIR                        
Debt Instrument [Line Items]                        
Extinguishment of debt, amount                 $ 108,000      
Senior Unsecured Notes                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)   3.75%           3.75%        
Loss on early extinguishment of debt               $ (126)        
Unsecured Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity               750,000        
Principal of properties collateralized               $ 1,950,000        
Maturity term of revolving credit facility | extension_option               2        
Debt Instrument, optional extension period               6 months        
Debt instrument, rate premium               1.10%        
Commitment fee percentage               0.25%        
Interest rate (as a percent)               2.70% 3.60%      
Weighted average annual interest rate               3.30% 3.00% 2.40%    
Unsecured revolving credit facility               $ 0        
Available borrowings               750,000        
Subsequent Event | Senior Unsecured Notes | 3.60% Senior Unsecured Notes                        
Debt Instrument [Line Items]                        
Repayments of debt       $ 400,000                
Subsequent Event | Senior Unsecured Notes | Senior unsecured notes, 3.60% interest rate, due in 2020                        
Debt Instrument [Line Items]                        
Interest rate (as a percent) 3.60%                      
Repayments of debt $ 400,000                      
Subsequent Event | SIR | Senior Unsecured Notes | Senior unsecured notes, 3.60% interest rate, due in 2020                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)       3.60%                
Subsequent Event | Unsecured Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Unsecured revolving credit facility                     $ 335,000  
Available borrowings                     $ 415,000  
Liabilities of Properties Held For Sale | Mortgage Note Payable                        
Debt Instrument [Line Items]                        
Long-term debt               $ 13,166        
LIBOR | Unsecured Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Basis spread on variable rate               1.25%