Annual report pursuant to Section 13 and 15(d)

Notes Payable - Unsecured Notes and Term Loans Outstanding (Details)

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Notes Payable - Unsecured Notes and Term Loans Outstanding (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Nov. 30, 2019
Dec. 31, 2018
Unsecured Debt      
Debt Instrument [Line Items]      
Total principal $ 1,000,000,000   $ 1,000,000,000
Premiums and discounts, net (797,000)   (1,189,000)
Deferred issuance costs, net (2,481,000)   (3,414,000)
Total, net 996,722,000   995,397,000
Principal amounts due $ 0    
10 Year Unsecured Notes 4.95%      
Debt Instrument [Line Items]      
Coupon/Stated rate (percent)   4.95%  
10 Year Unsecured Notes 4.95% | Unsecured Debt      
Debt Instrument [Line Items]      
Coupon/Stated rate (percent) 4.95%    
Effective interest rate (percent) [1] 5.05%    
Total principal $ 250,000,000   250,000,000
Payoff Date/Maturity Date [2] Oct. 01, 2020    
2015 Term Loan | Unsecured Debt      
Debt Instrument [Line Items]      
Effective interest rate (percent) [1] 2.72%    
Total principal $ 150,000,000   150,000,000
Payoff Date/Maturity Date [2] Mar. 15, 2021    
2015 Term Loan | Unsecured Debt | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate (percent) 1.10%    
10 Year Unsecured Notes 3.95% | Unsecured Debt      
Debt Instrument [Line Items]      
Coupon/Stated rate (percent) 3.95%    
Effective interest rate (percent) [1] 4.02%    
Total principal $ 300,000,000   300,000,000
Payoff Date/Maturity Date [2] Oct. 15, 2022    
2018 Term Loan | Unsecured Debt      
Debt Instrument [Line Items]      
Effective interest rate (percent) [1],[3] 2.87%    
Total principal [3] $ 250,000,000   250,000,000
Payoff Date/Maturity Date [2] Jul. 21, 2023    
2018 Term Loan | Unsecured Debt | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate (percent) 1.10%    
30 Year Unsecured Notes 7.25% | Unsecured Debt      
Debt Instrument [Line Items]      
Coupon/Stated rate (percent) 7.25%    
Effective interest rate (percent) [1] 7.36%    
Total principal $ 50,000,000   $ 50,000,000
Payoff Date/Maturity Date [2] Feb. 25, 2028    
[1]
For fixed rate notes, the effective rate represents the yield on issuance date, including the effects of discounts on the notes. For variable rate notes, the effective rate represents the rate as fixed by interest rate derivatives (see note 8).
[2] No principal amounts are due prior to maturity.
[3]
The 2018 Term Loan increased and replaced the 2016 Term Loan (see note 6).