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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,602,785  
Unsecured Credit Facility 0 $ 158,000
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% 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% 3.96%
Maturity Date Feb. 15, 2030  
2030 II Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 100,000 $ 0
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 $ 0
Interest Rate 2.84%  
Effective Interest Rate 2.84% 2.84%
Maturity Date Sep. 17, 2032  
2014 Unsecured Term Loan    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 0 $ 200,000
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 (A)    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 200,000 0
Interest Rate 3.79%  
Maturity Date Jul. 15, 2021  
Mortgage Loans Payable    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 144,214 174,360
Unamortized Debt Issuance Costs (335) (675)
Long-term Debt $ 143,879 173,685
Maturity Date Range, Start Oct. 01, 2021  
Maturity Date Range, End Aug. 01, 2028  
Senior Unsecured Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 998,571 698,571
Unamortized Debt Issuance Costs (6,206) (4,485)
Long-term Debt 992,300 694,015
Unamortized Discounts (65) (71)
Unsecured Term Loans    
Debt Instrument [Line Items]    
Long-term Debt, Gross 460,000 460,000
Unamortized Debt Issuance Costs (1,538) (2,135)
Long-term Debt 458,462 457,865
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs (1,049) (2,300)
Unsecured Credit Facility $ 0 $ 158,000
Maturity Date [1] Oct. 29, 2021  
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 4.85%  
Effective Interest Rate 4.85%  
[1] The maturity date may be extended an additional year at our election, subject to certain restrictions. Amounts exclude unamortized debt issuance costs of $1,049 and $2,300 as of December 31, 2020 and 2019, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.