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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Mortgage Loans Payable, Net $ 227,413 $ 304,508
Senior Unsecured Notes, Net 585,968 546,607
Unsecured Term Loans 461,106 461,317
Unsecured Credit Facility 158,177 0
Total 1,432,664 1,312,432
Carrying Amount (A)    
Debt Instrument [Line Items]    
Mortgage Loans Payable, Net [1] 222,274 297,716
Senior Unsecured Notes, Net [1] 548,497 548,494
Unsecured Term Loans [1] 460,000 460,000
Unsecured Credit Facility [1] 158,000 0
Total [1] $ 1,388,771 $ 1,306,210
[1] The carrying amounts include unamortized premiums and discounts and exclude unamortized debt issuance costs.