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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,306,181  
Unsecured Credit Facility 0 $ 144,500
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% 4.30%
Maturity Date Apr. 20, 2027  
2028 Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 150,000 $ 0
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% 4.40%
Maturity Date Apr. 20, 2029  
2030 Private Placement Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 150,000 $ 0
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 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 $ 297,610 451,602
Unamortized Debt Issuance Costs (1,246) (1,806)
Unamortized Premiums 106 260
Long-term Debt $ 296,470 450,056
Maturity Date Range, Start Jul. 01, 2019  
Maturity Date Range, End Aug. 01, 2028  
Senior Unsecured Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 548,571 248,571
Unamortized Debt Issuance Costs (3,990) (1,814)
Long-term Debt 544,504 246,673
Unamortized Discounts (77) (84)
Unsecured Term Loans    
Debt Instrument [Line Items]    
Long-term Debt, Gross 460,000 460,000
Unamortized Debt Issuance Costs (3,191) (4,232)
Long-term Debt 456,809 455,768
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs (3,554) (4,781)
Unsecured Credit Facility $ 0 $ 144,500
Maturity Date [2] Oct. 29, 2021  
Minimum | Mortgage Loans Payable    
Debt Instrument [Line Items]    
Interest Rate 4.03%  
Effective Interest Rate 3.82%  
Maximum | Mortgage Loans Payable    
Debt Instrument [Line Items]    
Interest Rate 8.26%  
Effective Interest Rate 8.26%  
[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 $3,554 and $4,781 as of December 31, 2018 and 2017, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.