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Mortgage Notes Payable - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Disclosure [Abstract]          
Interest expense capitalized $ 3,343 $ 2,562 $ 5,977 $ 4,865  
Fair value of mortgage notes payable $ 4,019,860   $ 4,019,860   $ 4,126,819