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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Mortgage Loans Payable, Net $ 450,056 $ 495,956
Senior Unsecured Notes, Net 246,673 204,998
Unsecured Term Loans, Net 455,768 456,638
Unsecured Credit Facility 144,500 189,500
2017 Notes    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Gross $ 0 54,981
Maturity Date Dec. 01, 2017  
2027 Notes    
Debt Instrument [Line Items]    
Senior Unsecured Notes, 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]    
Senior Unsecured Notes, 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]    
Senior Unsecured Notes, Gross $ 10,600 10,600
Interest Rate 7.75%  
Effective Interest Rate 7.87%  
Maturity Date Apr. 15, 2032  
2017 II Notes    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Gross $ 0 101,871
Maturity Date May 15, 2017  
2027 Private Placement Notes    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Gross $ 125,000 0
Interest Rate 4.30%  
Effective Interest Rate 4.30%  
Maturity Date Apr. 20, 2027  
2029 Private Placement Notes    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Gross $ 75,000 0
Interest Rate 4.40%  
Effective Interest Rate 4.40%  
Maturity Date Apr. 20, 2029  
2014 Unsecured Term Loan (A)    
Debt Instrument [Line Items]    
Unsecured Term Loans, Gross $ 200,000 200,000
Interest Rate [1] 3.49%  
Maturity Date Jan. 29, 2021  
2015 Unsecured Term Loan (A)    
Debt Instrument [Line Items]    
Unsecured Term Loans, Gross $ 260,000 260,000
Interest Rate [1] 2.99%  
Maturity Date Sep. 12, 2022  
Mortgage Loans Payable    
Debt Instrument [Line Items]    
Mortgage Loans Payable, Gross $ 451,602 498,435
Unamortized Debt Issuance Costs (1,806) (2,905)
Unamortized Premiums 260 426
Mortgage Loans Payable, Net $ 450,056 495,956
Maturity Date Range, Start Jun. 01, 2018  
Maturity Date Range, End Sep. 01, 2022  
Senior Unsecured Notes    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs $ (1,814) (320)
Senior Unsecured Notes, Gross 248,571 205,423
Unamortized Discounts (84) (105)
Senior Unsecured Notes, Net 246,673 204,998
Unsecured Term Loans    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs (4,232) (3,362)
Unsecured Term Loans, Gross 460,000 460,000
Unsecured Term Loans, Net 455,768 456,638
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs (4,781) (2,876)
Unsecured Credit Facility [2] $ 144,500 $ 189,500
Interest Rate 2.46%  
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] The interest rate at December 31, 2017 reflects the interest rate protection agreements we entered into to effectively convert the variable rate to a fixed rate. 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 $4,781 and $2,876 as of December 31, 2017 and 2016, respectively, which are included in prepaid expenses and other assets on the consolidated balance sheets.