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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,490,931    
Unsecured Credit Facility 158,000 $ 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 $ 125,000
Interest Rate 4.30%    
Effective Interest Rate 4.30%   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 $ 75,000
Interest Rate 4.40%    
Effective Interest Rate 4.40%   4.40%
Maturity Date Apr. 20, 2029    
2029 II Private Placement Notes      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 150,000 0  
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    
2014 Unsecured Term Loan (A)      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 200,000 $ 200,000  
Interest Rate [1] 3.39%    
Maturity Date Jan. 29, 2021    
2015 Unsecured Term Loan (A)      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 260,000 260,000  
Interest Rate [1] 2.89%    
Maturity Date Sep. 12, 2022    
Mortgage Loans Payable      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 174,360 297,610  
Unamortized Debt Issuance Costs (675) (1,246)  
Unamortized Premiums 0 106  
Long-term Debt $ 173,685 296,470  
Maturity Date Range, Start Jul. 01, 2020    
Maturity Date Range, End Aug. 01, 2028    
Senior Unsecured Notes      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 698,571 548,571  
Unamortized Debt Issuance Costs (4,485) (3,990)  
Long-term Debt 694,015 544,504  
Unamortized Discounts (71) (77)  
Unsecured Term Loans      
Debt Instrument [Line Items]      
Long-term Debt, Gross 460,000 460,000  
Unamortized Debt Issuance Costs (2,135) (3,191)  
Long-term Debt 457,865 456,809  
Unsecured Credit Facility      
Debt Instrument [Line Items]      
Unamortized Debt Issuance Costs (2,300) (3,554)  
Unsecured Credit Facility $ 158,000 $ 0  
Interest Rate 2.90%    
Maturity Date [2] 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 6.50%    
Effective Interest Rate 6.50%    
[1] See Note 12.
[2] The maturity date may be extended an additional year at our election, subject to certain restrictions. Amounts exclude unamortized debt issuance costs of $2,300 and $3,554 as of December 31, 2019 and 2018, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.