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Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Mortgage Loans Payable, Net $ 455,016 $ 495,956
Senior Unsecured Notes, Net 301,554 204,998
Unsecured Term Loans, Net 456,971 456,638
Unsecured Credit Facility 127,000 189,500
2017 Notes    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Gross $ 54,981 54,981
Interest Rate 7.50%  
Effective Interest Rate 7.52%  
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 [1] $ 200,000 200,000
Interest Rate [1] 3.99%  
Maturity Date [1] Jan. 29, 2021  
2015 Unsecured Term Loan (A)    
Debt Instrument [Line Items]    
Unsecured Term Loans, Gross [1] $ 260,000 260,000
Interest Rate [1] 3.39%  
Maturity Date [1] Sep. 12, 2022  
Mortgage Loans Payable    
Debt Instrument [Line Items]    
Mortgage Loans Payable, Gross $ 456,928 498,435
Unamortized Deferred Financing Costs (2,255) (2,905)
Unamortized Premiums 343 426
Mortgage Loans Payable, Net $ 455,016 495,956
Maturity Date Range, Start Jun. 01, 2018  
Maturity Date Range, End Sep. 01, 2022  
Senior Unsecured Notes    
Debt Instrument [Line Items]    
Unamortized Deferred Financing Costs $ (1,909) (320)
Senior Unsecured Notes, Gross 303,552 205,423
Unamortized Discounts (89) (105)
Senior Unsecured Notes, Net 301,554 204,998
Unsecured Term Loan    
Debt Instrument [Line Items]    
Unamortized Deferred Financing Costs (3,029) (3,362)
Unsecured Term Loans, Gross 460,000 460,000
Unsecured Term Loans, Net 456,971 456,638
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Unamortized Deferred Financing Costs (2,213) (2,876)
Unsecured Credit Facility [2] $ 127,000 $ 189,500
Interest Rate [2] 2.22%  
Maturity Date [2] Mar. 11, 2019  
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 June 30, 2017 reflects the interest rate protection agreements 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 deferred financing costs of $2,213 and $2,876 as of June 30, 2017 and December 31, 2016, respectively, which are included in prepaid expenses and other assets on the consolidated balance sheets.