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Mortgage Notes Payable - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Disclosure [Abstract]          
Interest expense capitalized $ 3,428 $ 2,707 $ 9,405 $ 7,572  
Fair value of mortgage notes payable $ 4,112,364   $ 4,112,364   $ 4,126,819