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Notes Payable - (Terms of Notes Payable) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Feb. 02, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Notes Payable, Gross $ 1,935,835   $ 2,218,093
Unamortized premium 9,406   11,239
Unamortized loan costs (5,724)   (6,357)
Total Notes Payable $ 1,939,517   2,222,975
Weighted average maturity of notes payable 5 years 4 months 24 days    
Unsecured Notes      
Debt Instrument [Line Items]      
Notes Payable, Gross $ 1,250,000   1,501,500
Credit Facility, Unsecured      
Debt Instrument [Line Items]      
Interest Rate 1.21%    
Notes Payable, Gross $ 0   251,500
Term Loan, Unsecured      
Debt Instrument [Line Items]      
Interest Rate 1.36%    
Notes Payable, Gross $ 250,000   250,000
Senior Notes, Unsecured | 3.95% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest Rate 3.95%    
Notes Payable, Gross $ 275,000   275,000
Senior Notes, Unsecured | 3.91% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest Rate 3.91%    
Notes Payable, Gross $ 250,000   250,000
Senior Notes, Unsecured | 3.86% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest Rate 3.86%    
Notes Payable, Gross $ 250,000   250,000
Senior Notes, Unsecured | 3.78% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest Rate 3.78%    
Notes Payable, Gross $ 125,000   125,000
Senior Notes, Unsecured | 4.09% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest Rate 4.09%    
Notes Payable, Gross $ 100,000   100,000
Secured Mortgage Notes      
Debt Instrument [Line Items]      
Notes Payable, Gross $ 685,835   716,593
Secured Mortgage Notes | Fifth Third Center      
Debt Instrument [Line Items]      
Interest Rate 3.37%    
Notes Payable, Gross $ 138,709   140,332
Secured Mortgage Notes | Terminus 100      
Debt Instrument [Line Items]      
Interest Rate 5.25%    
Notes Payable, Gross $ 116,593   118,146
Secured Mortgage Notes | Colorado Tower      
Debt Instrument [Line Items]      
Interest Rate 3.45%    
Notes Payable, Gross $ 115,883   117,085
Secured Mortgage Notes | Promenade      
Debt Instrument [Line Items]      
Interest Rate 4.27%    
Notes Payable, Gross $ 94,308   95,986
Secured Mortgage Notes | 816 Congress      
Debt Instrument [Line Items]      
Interest Rate 3.75%    
Notes Payable, Gross $ 79,118   79,987
Secured Mortgage Notes | Terminus 200      
Debt Instrument [Line Items]      
Interest Rate 3.79%    
Notes Payable, Gross $ 75,224   76,079
Secured Mortgage Notes | Legacy Union One      
Debt Instrument [Line Items]      
Interest Rate 4.24%    
Notes Payable, Gross $ 66,000   66,000
Secured Mortgage Notes | Meridian Mark Plaza      
Debt Instrument [Line Items]      
Interest Rate 6.00%    
Notes Payable, Gross $ 0 $ 23,000 $ 22,978