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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,615,688  
Unsecured Credit Facility 74,000 $ 0
2027 Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 6,070 6,070
Interest Rate 7.15%  
Effective Interest Rate 7.11%  
Maturity Date May 15, 2027  
2028 Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 31,901 31,901
Interest Rate 7.60%  
Effective Interest Rate 8.13%  
Maturity Date Jul. 15, 2028  
2032 Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 10,600 10,600
Interest Rate 7.75%  
Effective Interest Rate 7.87%  
Maturity Date Apr. 15, 2032  
2027 Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 125,000 125,000
Interest Rate 4.30%  
Effective Interest Rate 4.30%  
Maturity Date Apr. 20, 2027  
2028 Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 150,000 150,000
Interest Rate 3.86%  
Effective Interest Rate 3.86%  
Maturity Date Feb. 15, 2028  
2029 Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 75,000 75,000
Interest Rate 4.40%  
Effective Interest Rate 4.40%  
Maturity Date Apr. 20, 2029  
2029 II Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 150,000 150,000
Interest Rate 3.97%  
Effective Interest Rate 4.23%  
Maturity Date Jul. 23, 2029  
2030 Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 150,000 150,000
Interest Rate 3.96%  
Effective Interest Rate 3.96%  
Maturity Date Feb. 15, 2030  
2030 II Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 100,000 100,000
Interest Rate 2.74%  
Effective Interest Rate 2.74%  
Maturity Date Sep. 17, 2030  
2032 Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 200,000 200,000
Interest Rate 2.84%  
Effective Interest Rate 2.84%  
Maturity Date Sep. 17, 2032  
2015 Unsecured Term Loan    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 260,000 260,000
Interest Rate 2.89%  
Maturity Date Sep. 12, 2022  
2020 Unsecured Term Loan    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 0 200,000
2021 Unsecured Term Loan    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 200,000 0
Interest Rate 1.84%  
Maturity Date Jul. 07, 2026  
Mortgage Loans Payable    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 83,117 144,214
Unamortized Debt Issuance Costs (126) (335)
Long-term Debt $ 82,991 143,879
Maturity Date Range, Start Sep. 01, 2022  
Maturity Date Range, End Aug. 01, 2028  
Senior Unsecured Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 998,571 998,571
Unamortized Debt Issuance Costs (5,670) (6,206)
Unamortized Discounts (60) (65)
Long-term Debt 992,841 992,300
Unsecured Term Loan    
Debt Instrument [Line Items]    
Long-term Debt, Gross 460,000 460,000
Unamortized Debt Issuance Costs (1,896) (1,538)
Long-term Debt 458,104 458,462
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs (4,897) (1,049)
Unsecured Credit Facility [1] $ 74,000 $ 0
Interest Rate 0.86%  
Maturity Date [1] Jul. 07, 2025  
Minimum | Mortgage Loans Payable    
Debt Instrument [Line Items]    
Interest Rate 4.03%  
Effective Interest Rate 4.03%  
Maximum | Mortgage Loans Payable    
Debt Instrument [Line Items]    
Interest Rate 4.17%  
Effective Interest Rate 4.17%  
[1] Amounts exclude unamortized debt issuance costs of $4,897 and $1,049 as of September 30, 2021 and December 31, 2020, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.