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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,617,335    
Unsecured Credit Facility 79,000 $ 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 $ 150,000
Interest Rate 3.97%   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% 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% 2.84%  
Maturity Date Sep. 17, 2032    
2015 Unsecured Term Loan (A)      
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 (A)      
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 $ 79,764 144,214  
Unamortized Debt Issuance Costs (90) (335)  
Long-term Debt $ 79,674 143,879  
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 (5,491) (6,206)  
Unamortized Discounts (59) (65)  
Long-term Debt 993,021 992,300  
Unsecured Term Loans      
Debt Instrument [Line Items]      
Long-term Debt, Gross 460,000 460,000  
Unamortized Debt Issuance Costs (1,675) (1,538)  
Long-term Debt 458,325 458,462  
Unsecured Credit Facility      
Debt Instrument [Line Items]      
Unamortized Debt Issuance Costs (4,577) (1,049)  
Unsecured Credit Facility $ 79,000 $ 0  
Interest Rate 0.88%    
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] The maturity date may be extended an additional year at our election, subject to certain restrictions. Amounts exclude unamortized debt issuance costs of $4,577 and $1,049 as of December 31, 2021 and 2020, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.