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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jul. 23, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,388,845    
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
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  
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    
2014 Unsecured Term Loan (A)      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 200,000   200,000
Interest Rate [1] 3.39%    
Maturity Date [1] 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 [1] Sep. 12, 2022    
Mortgage Loans Payable      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 222,274   297,610
Unamortized Debt Issuance Costs (917)   (1,246)
Unamortized Premiums 0   106
Long-term Debt $ 221,357   296,470
Maturity Date Range, Start Dec. 01, 2019    
Maturity Date Range, End Aug. 01, 2028    
Senior Unsecured Notes      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 548,571   548,571
Unamortized Debt Issuance Costs (3,782)   (3,990)
Unamortized Discounts 74   77
Long-term Debt 544,715   544,504
Unsecured Term Loan      
Debt Instrument [Line Items]      
Long-term Debt, Gross 460,000   460,000
Unamortized Debt Issuance Costs (2,663)   (3,191)
Long-term Debt 457,337   456,809
Unsecured Credit Facility      
Debt Instrument [Line Items]      
Unamortized Debt Issuance Costs (2,927)   (3,554)
Unsecured Credit Facility [2] $ 158,000   $ 0
Interest Rate [1] 3.51%    
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 8.26%    
Effective Interest Rate 8.26%    
[1] The interest rate at June 30, 2019 also reflects the derivative instruments we entered into to effectively convert the variable rate to a fixed rate. See Note 10.
[2] The maturity date may be extended an additional year at our election, subject to certain restrictions. Amounts exclude unamortized debt issuance costs of $2,927 and $3,554 as of June 30, 2019 and December 31, 2018, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.