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Fair Value Measurements - Fair Value of Financial Instruments Presented at Carrying Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Carrying Value    
Debt Instrument [Line Items]    
Mortgages payable $ 176,502 $ 213,925
Term loans 400,000 352,000
Estimated Fair Value    
Debt Instrument [Line Items]    
Mortgages payable 180,671 212,572
Term loans $ 400,004 $ 352,006