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Fair Value Measurements (Details) - Mortgages and Loans Payable - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Recorded value $ 1,856,984 $ 1,823,040
Deferred financing costs 14,037 16,042
Fair Value, Inputs, Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 1,812,086 $ 1,765,151